block: bdrv_create(): don't leak cco.filename on error

Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

block.c

@@ -379,7 +379,8 @@ int bdrv_create(BlockDriver *drv, const char* filename,
     };
 
     if (!drv->bdrv_create) {
-        return -ENOTSUP;
+        ret = -ENOTSUP;
+        goto out;
     }
 
     if (qemu_in_coroutine()) {
@@ -394,8 +395,9 @@ int bdrv_create(BlockDriver *drv, const char* filename,
     }
 
     ret = cco.ret;
-    g_free(cco.filename);
 
+out:
+    g_free(cco.filename);
     return ret;
 }