ocfs2: free inode when ocfs2_get_init_inode() fails

syzbot is reporting busy inodes after unmount, for commit 9c89fe0
("ocfs2: Handle error from dquot_initialize()") forgot to call iput() when
new_inode() succeeded and dquot_initialize() failed.

Link: https://lkml.kernel.org/r/e68c0224-b7c6-4784-b4fa-a9fc8c675525@I-love.SAKURA.ne.jp
Fixes: 9c89fe0 ("ocfs2: Handle error from dquot_initialize()")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot+0af00f6a2cba2058b5db@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=0af00f6a2cba2058b5db
Tested-by: syzbot+0af00f6a2cba2058b5db@syzkaller.appspotmail.com
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: Tetsuo Handa

fs/ocfs2/namei.c

@@ -200,8 +200,10 @@ static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t mode)
 	mode = mode_strip_sgid(&nop_mnt_idmap, dir, mode);
 	inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
 	status = dquot_initialize(inode);
-	if (status)
+	if (status) {
+		iput(inode);
 		return ERR_PTR(status);
+	}
 
 	return inode;
 }