block: downgrade a bio_full call in bio_add_page

bio_add_page already checks that there is space in bi_size a little
earlier.  So after we failed to add to an existing segment, just check
that there is another one available instead of duplicating the bi_size
check.

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

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