md/raid10: remove unnecessary barrier around bio_submit_split_bioset()

raid10_write_request() drops the barrier before calling
bio_submit_split_bioset() and reacquires it afterwards. This is no
longer necessary because the split bio cannot re-enter
raid10_write_request() while the barrier is held.

The allow_barrier()/wait_barrier() pair was introduced by commit
e820d55cb99d ("md: fix raid10 hang issue caused by barrier") when
submit_flushes() called md_handle_request() directly, allowing re-entry
into raid10_write_request(). Since v5.2, submit_flushes() has instead
gone through submit_bio(), eliminating that recursion. submit_flushes()
was later removed entirely by commit b75197e86e6d ("md: Remove flush
handling").

Currently, raid10_write_request() is only entered from the bio
submission path, so the split bio submitted by bio_submit_split_bioset()
cannot recurse back into wait_barrier().

Remove the redundant allow_barrier()/wait_barrier() pair around
bio_submit_split_bioset().

Signed-off-by: Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>
Reviewed-by: Yu Kuai <yukuai@fygo.io>
Link: https://patch.msgid.link/20260710101521.1714-5-abd.masalkhi@gmail.com
Signed-off-by: Yu Kuai <yukuai@fygo.io>

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