src/xvba_video.c: xvba_CreateConfig() extra checking

Add extra checking.

src/xvba_video.c

@@ -391,6 +391,8 @@ xvba_CreateConfig(
         return VA_STATUS_ERROR_UNSUPPORTED_PROFILE;
 
     configID = object_heap_allocate(&driver_data->config_heap);
+    if (configID == VA_INVALID_ID)
+        return VA_STATUS_ERROR_ALLOCATION_FAILED;
     obj_config = XVBA_CONFIG(configID);
     if (!obj_config)
         return VA_STATUS_ERROR_ALLOCATION_FAILED;
@@ -429,6 +431,7 @@ xvba_DestroyConfig(
         return VA_STATUS_ERROR_INVALID_CONFIG;
 
     object_heap_free(&driver_data->config_heap, (object_base_p)obj_config);
+    config_id = VA_INVALID_ID;
     return VA_STATUS_SUCCESS;
 }