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 <hch@lst.de>
Reviewed-by: Jinyoung Choi <j-young.choi@samsung.com>
Link: https://lore.kernel.org/r/20230724165433.117645-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/bio.c

@@ -1126,7 +1126,7 @@ int bio_add_page(struct bio *bio, struct page *page,
 	    __bio_try_merge_page(bio, page, len, offset, &same_page))
 		return len;
 
-	if (bio_full(bio, len))
+	if (bio->bi_vcnt >= bio->bi_max_vecs)
 		return 0;
 	__bio_add_page(bio, page, len, offset);
 	return len;