Bug 1148832 - Return early from nsAlertsIconListener::OnLoadComplete if the image has an error. r=baku, a=sledru

toolkit/system/gnome/nsAlertsIconListener.cpp

@@ -137,7 +137,9 @@ nsAlertsIconListener::OnLoadComplete(imgIRequest* aRequest)
 
   nsCOMPtr<imgIContainer> image;
   rv = aRequest->GetImage(getter_AddRefs(image));
-  MOZ_ASSERT(image);
+  if (NS_WARN_IF(NS_FAILED(rv) || !image)) {
+    return rv;
+  }
 
   // Ask the image to decode at its intrinsic size.
   int32_t width = 0, height = 0;