dm mpath: retry BLK_STS_RESOURCE errors

Retry requests instead of failing them if an out-of-memory error occurs
or the block driver below dm-mpath is busy.  This restores the v4.12
behavior of noretry_error(), namely that -ENOMEM results in a retry.

Fixes: 2a842ac ("block: introduce new block status code type")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm-mpath.c

@@ -1458,7 +1458,6 @@ static int noretry_error(blk_status_t error)
 	case BLK_STS_TARGET:
 	case BLK_STS_NEXUS:
 	case BLK_STS_MEDIUM:
-	case BLK_STS_RESOURCE:
 		return 1;
 	}