block/drbd: remove useless comments in receive_DataReply()

All implementations of req->collision, _req_may_be_done and
drbd_fail_pending_reads have been removed, so remove the comments
in receive_DataReply() that provide no useful information.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20220920015216.782190-3-cuigaosheng1@huawei.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/drbd/drbd_receiver.c

@@ -2113,9 +2113,6 @@ static int receive_DataReply(struct drbd_connection *connection, struct packet_i
 	if (unlikely(!req))
 		return -EIO;
 
-	/* hlist_del(&req->collision) is done in _req_may_be_done, to avoid
-	 * special casing it there for the various failure cases.
-	 * still no race with drbd_fail_pending_reads */
 	err = recv_dless_read(peer_device, req, sector, pi->size);
 	if (!err)
 		req_mod(req, DATA_RECEIVED);