Fixing race condition in UIImageView category with cached images. Thanks @iwat (Chaiwat S.)

Author: mattt

AFNetworking/UIImageView+AFNetworking.m

@@ -92,6 +92,7 @@ - (void)setImageWithURLRequest:(NSURLRequest *)urlRequest
     UIImage *cachedImage = [[AFImageCache sharedImageCache] cachedImageForURL:[urlRequest URL] cacheName:nil];
     if (cachedImage) {
         self.image = cachedImage;
+        self.af_imageRequestOperation = nil;
 
         if (success) {
             success(nil, nil, cachedImage);