iUI: Appirater: Fix warning by casting properly.

iPhone/MobileAuctions/MobileAuctions/Appirater.m

@@ -98,7 +98,7 @@ NSString *templateReviewURL = @"itms-apps://ax.itunes.apple.com/WebObjects/MZSto
 	while (appirater == nil)
 	{
 		Appirater *temp = [[self alloc] init];
-		if(!OSAtomicCompareAndSwapPtrBarrier(0x0, temp, &appirater))
+		if(!OSAtomicCompareAndSwapPtrBarrier(0x0, temp, (void * volatile *)&appirater))
 			[temp release];
 		
 		[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillResignActive) name:@"UIApplicationWillResignActiveNotification" object:nil];