f2fs: set errno when f2fs_iget failed in recover_dentry

We should set the error number correctly when we fail in recover_dentry(), so
the recover flow could stop for the reason as error number shows instead of
continuing.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

fs/f2fs/recovery.c

@@ -75,7 +75,8 @@ retry:
 		einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino));
 		if (IS_ERR(einode)) {
 			WARN_ON(1);
-			if (PTR_ERR(einode) == -ENOENT)
+			err = PTR_ERR(einode);
+			if (err == -ENOENT)
 				err = -EEXIST;
 			goto out_unmap_put;
 		}