We were returning with 0 (success) because we weren't extracting the
error code from em (PTR_ERR(em)). Fix it.
Signed-off-by: NFilipe Manana <fdmanana@suse.com>
Reviewed-by: NSatoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: NChris Mason <clm@fb.com>