The blk_mq_all_tag_iter() is a void function, thus remove
the redundant 'return' statement in this function.
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>