Fix coding style issue

Replace:

  if (-1 == foo())

with:

  if (foo() == -1)

While this coding style is not in direct contravention of our currently
ratified CODING_STYLE treaty, it could be argued that the Article 3 of
the European Convention on Human Rights (prohibiting torture and "inhuman
or degrading treatment") reads on the matter.

[This commit message was brought to you without humour, as is evidenced
by the absence of any emoticons]
Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

hw/qdev.c

@@ -137,7 +137,7 @@ static int set_property(const char *name, const char *value, void *opaque)
     if (strcmp(name, "bus") == 0)
         return 0;
 
-    if (-1 == qdev_prop_parse(dev, name, value)) {
+    if (qdev_prop_parse(dev, name, value) == -1) {
         qemu_error("can't set property \"%s\" to \"%s\" for \"%s\"\n",
                    name, value, dev->info->name);
         return -1;

qemu-config.c

@@ -186,7 +186,7 @@ int qemu_set_option(const char *str)
         return -1;
     }
 
-    if (-1 == qemu_opt_set(opts, arg, str+offset+1)) {
+    if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
         fprintf(stderr, "failed to set \"%s\" for %s \"%s\"\n",
                 arg, lists[i]->name, id);
         return -1;

qemu-option.c

@@ -267,7 +267,7 @@ int set_option_parameter(QEMUOptionParameter *list, const char *name,
     // Process parameter
     switch (list->type) {
     case OPT_FLAG:
-        if (-1 == parse_option_bool(name, value, &flag))
+        if (parse_option_bool(name, value, &flag) == -1)
             return -1;
         list->value.n = flag;
         break;
@@ -282,7 +282,7 @@ int set_option_parameter(QEMUOptionParameter *list, const char *name,
         break;
 
     case OPT_SIZE:
-        if (-1 == parse_option_size(name, value, &list->value.n))
+        if (parse_option_size(name, value, &list->value.n) == -1)
             return -1;
         break;
 
@@ -745,7 +745,7 @@ int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname
         }
         if (strcmp(option, "id") != 0) {
             /* store and parse */
-            if (-1 == qemu_opt_set(opts, option, value)) {
+            if (qemu_opt_set(opts, option, value) == -1) {
                 return -1;
             }
         }

vl.c

@@ -5142,7 +5142,7 @@ int main(int argc, char **argv, char **envp)
                     fprintf(stderr, "parse error: %s\n", optarg);
                     exit(1);
                 }
-                if (NULL == qemu_chr_open_opts(opts, NULL)) {
+                if (qemu_chr_open_opts(opts, NULL) == NULL) {
                     exit(1);
                 }
                 break;