Revert "Fix output of uninitialized strings"

This reverts commit 8cf07dcb.

This is a sorry saga.

This commit:

  8e4416af net: Add parameter checks for VLAN clients

broken '-net socket' and this commit:

  ffad4116 net: Fix -net socket parameter checks

fixed the problem but introduced another problem which
this commit:

  8cf07dcb Fix output of uninitialized strings

fixed that final problem, but causing us to lose some
error reporting information in the process.

Meanwhile Jan posted a patch to mostly re-do ffad4116
in a way that fixes the original issue, but without
losing the error reporting information. So, let's revert
8cf07dcb and apply Jan's patch.
Signed-off-by: NMark McLoughlin <markmc@redhat.com>

net.c

@@ -1912,7 +1912,8 @@ int net_client_init(const char *device, const char *p)
         int idx = nic_get_free_idx();
 
         if (check_params(nic_params, p) < 0) {
-            fprintf(stderr, "qemu: invalid parameter in '%s'\n", p);
+            fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
+                    buf, p);
             return -1;
         }
         if (idx == -1 || nb_nics >= MAX_NICS) {
@@ -1962,7 +1963,8 @@ int net_client_init(const char *device, const char *p)
             "vlan", "name", "hostname", "restrict", "ip", NULL
         };
         if (check_params(slirp_params, p) < 0) {
-            fprintf(stderr, "qemu: invalid parameter in '%s'\n", p);
+            fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
+                    buf, p);
             return -1;
         }
         if (get_param_value(buf, sizeof(buf), "hostname", p)) {
@@ -2012,7 +2014,8 @@ int net_client_init(const char *device, const char *p)
         char ifname[64];
 
         if (check_params(tap_params, p) < 0) {
-            fprintf(stderr, "qemu: invalid parameter in '%s'\n", p);
+            fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
+                    buf, p);
             return -1;
         }
         if (get_param_value(ifname, sizeof(ifname), "ifname", p) <= 0) {
@@ -2032,7 +2035,8 @@ int net_client_init(const char *device, const char *p)
         vlan->nb_host_devs++;
         if (get_param_value(buf, sizeof(buf), "fd", p) > 0) {
             if (check_params(fd_params, p) < 0) {
-                fprintf(stderr, "qemu: invalid parameter in '%s'\n", p);
+                fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
+                        buf, p);
                 return -1;
             }
             fd = strtol(buf, NULL, 0);
@@ -2044,7 +2048,8 @@ int net_client_init(const char *device, const char *p)
                 "vlan", "name", "ifname", "script", "downscript", NULL
             };
             if (check_params(tap_params, p) < 0) {
-                fprintf(stderr, "qemu: invalid parameter in '%s'\n", p);
+                fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
+                        buf, p);
                 return -1;
             }
             if (get_param_value(ifname, sizeof(ifname), "ifname", p) <= 0) {
@@ -2064,7 +2069,8 @@ int net_client_init(const char *device, const char *p)
         if (get_param_value(buf, sizeof(buf), "fd", p) > 0) {
             int fd;
             if (check_params(fd_params, p) < 0) {
-                fprintf(stderr, "qemu: invalid parameter in '%s'\n", p);
+                fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
+                        buf, p);
                 return -1;
             }
             fd = strtol(buf, NULL, 0);
@@ -2076,7 +2082,8 @@ int net_client_init(const char *device, const char *p)
                 "vlan", "name", "listen", NULL
             };
             if (check_params(listen_params, p) < 0) {
-                fprintf(stderr, "qemu: invalid parameter in '%s'\n", p);
+                fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
+                        buf, p);
                 return -1;
             }
             ret = net_socket_listen_init(vlan, device, name, buf);
@@ -2085,7 +2092,8 @@ int net_client_init(const char *device, const char *p)
                 "vlan", "name", "connect", NULL
             };
             if (check_params(connect_params, p) < 0) {
-                fprintf(stderr, "qemu: invalid parameter in '%s'\n", p);
+                fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
+                        buf, p);
                 return -1;
             }
             ret = net_socket_connect_init(vlan, device, name, buf);
@@ -2094,7 +2102,8 @@ int net_client_init(const char *device, const char *p)
                 "vlan", "name", "mcast", NULL
             };
             if (check_params(mcast_params, p) < 0) {
-                fprintf(stderr, "qemu: invalid parameter in '%s'\n", p);
+                fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
+                        buf, p);
                 return -1;
             }
             ret = net_socket_mcast_init(vlan, device, name, buf);
@@ -2114,7 +2123,8 @@ int net_client_init(const char *device, const char *p)
 	int vde_port, vde_mode;
 
         if (check_params(vde_params, p) < 0) {
-            fprintf(stderr, "qemu: invalid parameter in '%s'\n", p);
+            fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
+                    buf, p);
             return -1;
         }
         vlan->nb_host_devs++;

vl.c

@@ -2228,7 +2228,8 @@ int drive_init(struct drive_opt *arg, int snapshot, void *opaque)
                                            NULL };
 
     if (check_params(params, str) < 0) {
-         fprintf(stderr, "qemu: unknown parameter in '%s'\n", str);
+         fprintf(stderr, "qemu: unknown parameter '%s' in '%s'\n",
+                         buf, str);
          return -1;
     }