f2fs: fix to detect cp error in f2fs_setxattr()

It needs to return -EIO if filesystem has been shutdown, fix the
miss case in f2fs_setxattr().
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/xattr.c

@@ -730,6 +730,8 @@ int f2fs_setxattr(struct inode *inode, int index, const char *name,
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	int err;
 
+	if (unlikely(f2fs_cp_error(sbi)))
+		return -EIO;
 	err = f2fs_is_checkpoint_ready(sbi);
 	if (err)
 		return err;