Fix a memory leak in the new delegate calling code - we were leaking …

…ourselves if the delegate was removed before we called it.

Classes/ASIHTTPRequest.m

@@ -1575,10 +1575,7 @@ - (void)callSelectorCallback:(SEL *)selectorPtr withTarget:(id *)targetPtr
 	id target = *targetPtr;
 	SEL selector = *selectorPtr;
 
-	if (!selector || !target)
-		return;
-
-	if ([target respondsToSelector:selector])
+	if (selector && target && [target respondsToSelector:selector])
 	{
 		[target performSelector:selector withObject:self];
 	}