can: dev: use skb_put_zero to simplfy code

use helper skb_put_zero to replace the pattern of skb_put() && memset()
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/dev.c

@@ -649,8 +649,7 @@ struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf)
 	can_skb_prv(skb)->ifindex = dev->ifindex;
 	can_skb_prv(skb)->skbcnt = 0;
 
-	*cf = skb_put(skb, sizeof(struct can_frame));
-	memset(*cf, 0, sizeof(struct can_frame));
+	*cf = skb_put_zero(skb, sizeof(struct can_frame));
 
 	return skb;
 }
@@ -678,8 +677,7 @@ struct sk_buff *alloc_canfd_skb(struct net_device *dev,
 	can_skb_prv(skb)->ifindex = dev->ifindex;
 	can_skb_prv(skb)->skbcnt = 0;
 
-	*cfd = skb_put(skb, sizeof(struct canfd_frame));
-	memset(*cfd, 0, sizeof(struct canfd_frame));
+	*cfd = skb_put_zero(skb, sizeof(struct canfd_frame));
 
 	return skb;
 }