ubifs: Add missing iput if do_tmpfile() failed in rename whiteout

hulk inclusion
category: bugfix
bugzilla: 185658 https://gitee.com/openeuler/kernel/issues/I4DDEL

---------------------------

whiteout inode should be put when do_tmpfile() failed if inode has been
initialized. Otherwise we will get following warning during umount:
  UBIFS error (ubi0:0 pid 1494): ubifs_assert_failed [ubifs]: UBIFS
  assert failed: c->bi.dd_growth == 0, in fs/ubifs/super.c:1930
  VFS: Busy inodes after unmount of ubifs. Self-destruct in 5 seconds.

Fixes: 9e0a1fff ("ubifs: Implement RENAME_WHITEOUT")
Signed-off-by: NZhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: NZhang Yi <yi.zhang@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

fs/ubifs/dir.c

@@ -1332,6 +1332,8 @@ static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
 
 		err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout);
 		if (err) {
+			if (whiteout)
+				iput(whiteout);
 			kfree(dev);
 			goto out_release;
 		}