f2fs: remove redundant parameter judgment

iput() has already judged the incoming parameter, so there is
no need to repeat the judgment here.
Signed-off-by: Wang Xiaojun <wangxiaojun11@huawei.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/namei.c

@@ -1111,7 +1111,6 @@ static int f2fs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
 out_old:
 	f2fs_put_page(old_page, 0);
 out:
-	if (whiteout)
 	iput(whiteout);
 	return err;
 }