s3: smbd - smb1 - fix read of deleted memory in reply_writeclose().

s3: smbd - smb1 - fix read of deleted memory in reply_writeclose().

While running smbtorture test raw.write under valgrind an "Invalid read"
was reported in methid reply_writeclose, it seems after closing a file
sometime later we try to access it again.

Signed-off-by: Noel Power <noel.power@suse.com>
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Mon Mar  3 20:42:40 CET 2014 on sn-devel-104