fs/ufs: restore s_lock mutex_init()

commit e4f95517 upstream.

Add last missing line in commit "cdd9eefd"
("fs/ufs: restore s_lock mutex")
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

fs/ufs/super.c

@@ -805,6 +805,7 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
 	UFSD("flag %u\n", (int)(sb->s_flags & MS_RDONLY));
 	
 	mutex_init(&sbi->mutex);
+	mutex_init(&sbi->s_lock);
 	spin_lock_init(&sbi->work_lock);
 	INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 	/*