Fixed a small memory leak.

Author: Edward Smith

Branch-SDK/Branch-SDK/BNCStrongMatchHelper.m

@@ -231,8 +231,10 @@ - (BOOL) willLoadViewControllerWithURL:(NSURL*)matchURL {
         fail |= ![self subclass:BNCMatchViewControllerSubclass selector:@selector(becomeFirstResponder)];
         fail |= ![self subclass:BNCMatchViewControllerSubclass selector:@selector(canBecomeFirstResponder)];
         fail |= ![self subclass:BNCMatchViewControllerSubclass selector:@selector(nextResponder)];
-        if (fail) return NO;
-
+        if (fail) {
+            objc_disposeClassPair(BNCMatchViewControllerSubclass);
+            return NO;
+        }
         objc_registerClassPair(BNCMatchViewControllerSubclass);
     }