fs/bio.c: remove nr_segs (unused function parameter)

nr_segs is no longer used in bio_alloc_map_data since c8db4448
("block: Don't save/copy bvec array anymore")
Signed-off-by: NFabian Frederick <fabf@skynet.be>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJens Axboe <axboe@fb.com>

fs/bio.c

@@ -1013,8 +1013,7 @@ static void bio_set_map_data(struct bio_map_data *bmd, struct bio *bio,
 	bio->bi_private = bmd;
 }
 
-static struct bio_map_data *bio_alloc_map_data(int nr_segs,
-					       unsigned int iov_count,
+static struct bio_map_data *bio_alloc_map_data(unsigned int iov_count,
 					       gfp_t gfp_mask)
 {
 	if (iov_count > UIO_MAXIOV)
@@ -1156,7 +1155,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
 	if (offset)
 		nr_pages++;
 
-	bmd = bio_alloc_map_data(nr_pages, iov_count, gfp_mask);
+	bmd = bio_alloc_map_data(iov_count, gfp_mask);
 	if (!bmd)
 		return ERR_PTR(-ENOMEM);