vrend: Don't check queries in wrong context.

If we can't switch to the original context for the query objects,
don't check it.

Signed-off-by: Lepton Wu <lepton@chromium.org>
Reviewed-by: Elie Tournier <elie.tournier@collabora.com>

src/vrend_renderer.c

@@ -8869,8 +8869,8 @@ static void vrend_renderer_check_queries(void)
    struct vrend_query *query, *stor;
 
    LIST_FOR_EACH_ENTRY_SAFE(query, stor, &vrend_state.waiting_query_list, waiting_queries) {
-      vrend_hw_switch_context(vrend_lookup_renderer_ctx(query->ctx_id), true);
-      if (vrend_check_query(query))
+      if (!vrend_hw_switch_context(vrend_lookup_renderer_ctx(query->ctx_id), true) ||
+	  vrend_check_query(query))
          list_delinit(&query->waiting_queries);
    }
 }