nvme-multipath: call bio_io_error in nvme_ns_head_submit_bio

Use bio_io_error() here since bio_io_error does the same thing.

Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>