[PATCH] erofs: fix error return code in erofs_fscache_meta_read_folio and erofs_fscache_read_folio

[Gao Xiang]

On Mon, Aug 15, 2022 at 11:48:29AM +0800, Sun Ke wrote:
> If erofs_fscache_alloc_request fail and then goto out, it will return 0.
> it should return a negative error code instead of 0.
> 
> Fixes: d435d53228dd ("erofs: change to use asynchronous io for fscache readpage/readahead")
> Signed-off-by: Sun Ke <sunke32 at huawei.com>

Minor, I tried to apply this patch by updating the patch title into
"erofs: fix error return code in erofs_fscache_{meta_,}read_folio"

since the original patch title is too long.

Thanks,
Gao Xiang