Fix bug #9213 - Bad ASN.1 NegTokenInit packet can cause invalid free.
Not the correct fix for the specific issue, but a general fix to
make sure this can never happen again.
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed Sep 26 04:07:57 CEST 2012 on sn-devel-104
(cherry picked from commit
83f60672e1b3069e6b1b90b376460da895e37df3)
(cherry picked from commit
d0b872ea7ca112d047b9ee2d10d1a75a2ee4aed3)
(cherry picked from commit
1b85990b833fe4ef2007e82ffe26ee18f87cb464)