block: move the bi_size overflow check in __bio_try_merge_page

Checking for availability in bi_size in a function that attempts to
merge into an existing segment is a bit odd, as the limit also applies
when adding a new segment.  This code works fine as we always call
__bio_try_merge_page, but contributes to sub-optimal calling conventions
and doesn't lead to clear code.

Move it to two of the callers instead, the third one already has a more
strict check that includes max_hw_segments anyway.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jinyoung Choi <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

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