s3-smbd: Don't segfault if user specified ports out for range.
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Wed Sep 26 16:28:44 CEST 2012 on sn-devel-104
(cherry picked from commit
50d324b7e070de4672eff3fb6231923e6dca807a)
Signed-off-by: Andreas Schneider <asn@samba.org>
Fix bug #9218 - Samba panics if a user specifies an invalid port number.
Autobuild-User(v4-0-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-0-test): Fri Sep 28 11:02:16 CEST 2012 on sn-devel-104