erofs: allow empty device tags in flatdev mode

Device tags aren't actually required in flatdev mode, thus fix mount
failure due to empty device tags in flatdev mode.

Signed-off-by: Jingbo Xu <[email protected]>
Fixes: 8b465fe ("erofs: support flattened block device for multi-blob images")
Reviewed-by: Jia Zhu <[email protected]>
Reviewed-by: Gao Xiang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Gao Xiang <[email protected]>

Author: lostjeffle

fs/erofs/super.c

@@ -235,7 +235,7 @@ static int erofs_init_device(struct erofs_buf *buf, struct super_block *sb,
 		return PTR_ERR(ptr);
 	dis = ptr + erofs_blkoff(sb, *pos);
 
-	if (!dif->path) {
+	if (!sbi->devs->flatdev && !dif->path) {
 		if (!dis->tag[0]) {
 			erofs_err(sb, "empty device tag @ pos %llu", *pos);
 			return -EINVAL;