pull up r19043 from trunk

pull up r19043 from trunk

 r19043@cathode-dark-space:  tlyu | 2007-01-09 14:45:25 -0500
 ticket: new
 target_version: 1.6
 tags: pullup
 subject: MITKRB5-SA-2006-003: mechglue argument handling too lax
 component: krb5-libs

 Fix mechglue argument checks so that output pointers are always
 initialized regardless of whether the other arguments fail to validate
 for some reason.  This avoids freeing of uninitialized pointers.

 Initialize the gss_buffer_descs in ovsec_kadmd.c.

ticket: 5302
version_fixed: 1.6

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@19045 dc483132-0cff-0310-8789-dd5450dbe970