Bug 1461954: Fix nsBulletFrame's image request registration code. r=tnikkel

Ideas for a test for this welcome :).

MozReview-Commit-ID: 1IpUlakeKXm

--HG--
extra : rebase_source : 54ef3968cb868b998cd161e70786c84304099729

layout/generic/nsBulletFrame.cpp

@@ -1413,7 +1413,7 @@ nsBulletFrame::RegisterImageRequest(bool aKnownToBeAnimated)
                                                     &isRequestRegistered);
     }
 
-    isRequestRegistered = mRequestRegistered;
+    mRequestRegistered = isRequestRegistered;
   }
 }
 
@@ -1431,7 +1431,7 @@ nsBulletFrame::DeregisterAndCancelImageRequest()
                                           mImageRequest,
                                           &isRequestRegistered);
 
-    isRequestRegistered = mRequestRegistered;
+    mRequestRegistered = isRequestRegistered;
 
     // Cancel the image request and forget about it.
     mImageRequest->CancelAndForgetObserver(NS_ERROR_FAILURE);