can: include: fix spelling mistakes

This patch fixes spelling erros found by "codespell" in the
include/linux/can subtree.

Link: https://lore.kernel.org/r/20200915223527.1417033-4-mkl@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

include/linux/can/core.h

@@ -2,7 +2,7 @@
 /*
  * linux/can/core.h
  *
- * Protoypes and definitions for CAN protocol modules using the PF_CAN core
+ * Prototypes and definitions for CAN protocol modules using the PF_CAN core
  *
  * Authors: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
  *          Urs Thuermann   <urs.thuermann@volkswagen.de>

include/linux/can/dev.h

@@ -108,7 +108,7 @@ static inline bool can_skb_headroom_valid(struct net_device *dev,
 
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 
-		/* preform proper loopback on capable devices */
+		/* perform proper loopback on capable devices */
 		if (dev->flags & IFF_ECHO)
 			skb->pkt_type = PACKET_LOOPBACK;
 		else