net/can: can_dropped_invalid_skb can be boolean

This patch makes can_dropped_invalid_skb return bool due to this
particular function only using either one or zero as its return
value.

No functional change.

Signed-off-by: Yaowei Bai <bywxiaobai@163.com>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/can/dev.h

@@ -78,7 +78,7 @@ struct can_priv {
 #define get_canfd_dlc(i)	(min_t(__u8, (i), CANFD_MAX_DLC))
 
 /* Drop a given socketbuffer if it does not contain a valid CAN frame. */
-static inline int can_dropped_invalid_skb(struct net_device *dev,
+static inline bool can_dropped_invalid_skb(struct net_device *dev,
 					  struct sk_buff *skb)
 {
 	const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
@@ -94,12 +94,12 @@ static inline int can_dropped_invalid_skb(struct net_device *dev,
 	} else
 		goto inval_skb;
 
-	return 0;
+	return false;
 
 inval_skb:
 	kfree_skb(skb);
 	dev->stats.tx_dropped++;
-	return 1;
+	return true;
 }
 
 static inline bool can_is_canfd_skb(const struct sk_buff *skb)