k5_utf8s_to_ucs2s could deref NULL pointer..

k5_utf8s_to_ucs2s could deref NULL pointer..

pull up r22177 from trunk

 ------------------------------------------------------------------------
 r22177 | epeisach | 2009-04-07 19:59:25 -0400 (Tue, 07 Apr 2009) | 10 lines
 Changed paths:
    M /trunk/src/util/support/utf8_conv.c

 ticket:
 Subject k5_utf8s_to_ucs2s could deref NULL pointer...

 Based on usage of this static function, this will never happen as
 results are always malloced (and checked) by caller.  However, the
 function is already coded to handle the first argument being null - so
 be consistent throughout.

ticket: 6468
version_fixed: 1.7
tags: pullup
target_version: 1.7

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-7@22251 dc483132-0cff-0310-8789-dd5450dbe970