Bug# 20730103 BACKPORT 19688008 TO 5.1

Problem: UDF doesn't handle the arguments properly when they
         are of string type due to a misplaced break.
         The length of arguments is also not set properly
         when the argument is NULL.

Solution: Fixed the code by putting the break at right place
          and setting the argument length to zero when the
          argument is NULL.

Conflicts:
	sql/item_func.cc

sql/item_func.cc

@@ -1,4 +1,4 @@
-/* Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
+/* Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
    Copyright (c) 2012, Twitter, Inc.
 
    This program is free software; you can redistribute it and/or modify