block/qapi: do not redundantly print "actual path"

If it happens to match the backing path, that was the actual path.
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Reviewed-by: NMax Reitz <mreitz@redhat.com>
Message-id: 1450122916-4706-2-git-send-email-jsnow@redhat.com
Signed-off-by: NMax Reitz <mreitz@redhat.com>

block/qapi.c

@@ -676,7 +676,9 @@ void bdrv_image_info_dump(fprintf_function func_fprintf, void *f,
 
     if (info->has_backing_filename) {
         func_fprintf(f, "backing file: %s", info->backing_filename);
-        if (info->has_full_backing_filename) {
+        if (info->has_full_backing_filename &&
+            (strcmp(info->backing_filename,
+                    info->full_backing_filename) != 0)) {
             func_fprintf(f, " (actual path: %s)", info->full_backing_filename);
         }
         func_fprintf(f, "\n");