[CIFS] relinquish fscache cookie before freeing CIFSTconInfo

Doh, fix a use after free bug.
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Reviewed-and-Tested-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/connect.c

@@ -1845,8 +1845,8 @@ cifs_put_tcon(struct cifsTconInfo *tcon)
 	CIFSSMBTDis(xid, tcon);
 	_FreeXid(xid);
 
-	tconInfoFree(tcon);
 	cifs_fscache_release_super_cookie(tcon);
+	tconInfoFree(tcon);
 	cifs_put_smb_ses(ses);
 }