can: af_can: can_rx_register(): use max() instead of open coding it

This patch replaces an open coded max by the proper kernel define max().
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

net/can/af_can.c

@@ -474,8 +474,8 @@ int can_rx_register(struct net *net, struct net_device *dev, canid_t can_id,
 		dev_rcv_lists->entries++;
 
 		rcv_lists_stats->rcv_entries++;
-		if (rcv_lists_stats->rcv_entries_max < rcv_lists_stats->rcv_entries)
-			rcv_lists_stats->rcv_entries_max = rcv_lists_stats->rcv_entries;
+		rcv_lists_stats->rcv_entries_max = max(rcv_lists_stats->rcv_entries_max,
+						       rcv_lists_stats->rcv_entries);
 	} else {
 		kmem_cache_free(rcv_cache, rcv);
 		err = -ENODEV;