btrfs: Remove redundant bio_get/bio_set pair from submit_one_bio

The bio is never referenced after it has been submitted so there is no
point in getting an extra reference.
Signed-off-by: NNikolay Borisov <nborisov@suse.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -2733,7 +2733,6 @@ static int __must_check submit_one_bio(struct bio *bio, int mirror_num,
 	start = page_offset(page) + bvec->bv_offset;
 
 	bio->bi_private = NULL;
-	bio_get(bio);
 
 	if (tree->ops)
 		ret = tree->ops->submit_bio_hook(tree->private_data, bio,
@@ -2741,7 +2740,6 @@ static int __must_check submit_one_bio(struct bio *bio, int mirror_num,
 	else
 		btrfsic_submit_bio(bio);
 
-	bio_put(bio);
 	return blk_status_to_errno(ret);
 }