sendkey: use consistent API convention

Even though rpc uses 'unsigned int' for the _len parameter that
passes the length of item<length>, the public libvirt APIs all
use 'int' and filter out lengths < 0, except for virDomainSendKey.

* include/libvirt/libvirt.h.in (virDomainSendKey): All other APIs
use int for array length.
* src/libvirt.c (virDomainSendKey): Adjust.
* src/driver.h (virDrvDomainSendKey): Likewise.
* daemon/remote_generator.pl: Likewise.

daemon/remote_generator.pl

@@ -1007,7 +1007,7 @@ elsif ($opt_k) {
                     my $limit = $3;
 
                     push(@args_list, "${type_name} *$arg_name");
-                    push(@args_list, "unsigned int ${arg_name}len");
+                    push(@args_list, "int ${arg_name}len");
                     push(@setters_list, "args.$arg_name.${arg_name}_val = $arg_name;");
                     push(@setters_list, "args.$arg_name.${arg_name}_len = ${arg_name}len;");
                     push(@args_check_list, { name => "\"$arg_name\"", arg => "${arg_name}len", limit => $limit });

include/libvirt/libvirt.h.in

@@ -1788,7 +1788,7 @@ int virDomainSendKey(virDomainPtr domain,
                      unsigned int codeset,
                      unsigned int holdtime,
                      unsigned int *keycodes,
-                     unsigned int nkeycodes,
+                     int nkeycodes,
                      unsigned int flags);
 
 /*

src/driver.h

@@ -568,7 +568,7 @@ typedef int
     (*virDrvDomainSendKey)(virDomainPtr dom, unsigned int codeset,
                            unsigned int holdtime,
                            unsigned int *keycodes,
-                           unsigned int nkeycodes,
+                           int nkeycodes,
                            unsigned int flags);
 
 typedef char *

src/libvirt.c

@@ -6653,7 +6653,7 @@ int virDomainSendKey(virDomainPtr domain,
                      unsigned int codeset,
                      unsigned int holdtime,
                      unsigned int *keycodes,
-                     unsigned int nkeycodes,
+                     int nkeycodes,
                      unsigned int flags)
 {
     virConnectPtr conn;
@@ -6663,7 +6663,7 @@ int virDomainSendKey(virDomainPtr domain,
     virResetLastError();
 
     if (keycodes == NULL ||
-        nkeycodes == 0 || nkeycodes > VIR_DOMAIN_SEND_KEY_MAX_KEYS) {
+        nkeycodes <= 0 || nkeycodes > VIR_DOMAIN_SEND_KEY_MAX_KEYS) {
         virLibDomainError(VIR_ERR_OPERATION_INVALID, __FUNCTION__);
         virDispatchError(NULL);
         return -1;