fs: remove a weird comment in submit_bh_wbc

All bios can get remapped if submitted to partitions.  No need to
comment on that.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

fs/buffer.c

@@ -3040,12 +3040,7 @@ static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
 	if (test_set_buffer_req(bh) && (op == REQ_OP_WRITE))
 		clear_buffer_write_io_error(bh);
 
-	/*
-	 * from here on down, it's all bio -- do the initial mapping,
-	 * submit_bio -> generic_make_request may further map this bio around
-	 */
 	bio = bio_alloc(GFP_NOIO, 1);
-
 	bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
 	bio_set_dev(bio, bh->b_bdev);
 	bio->bi_write_hint = write_hint;