can: raw: raw_sock_no_ioctlcmd(): mark function as static

This patch marks the raw_sock_no_ioctlcmd() function as static as it's
only used in this source file.

Fixes: 473d924d ("can: fix ioctl function removal")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

net/can/raw.c

@@ -835,8 +835,8 @@ static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 	return size;
 }
 
-int raw_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd,
-			 unsigned long arg)
+static int raw_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd,
+				unsigned long arg)
 {
 	/* no ioctls for socket layer -> hand it down to NIC layer */
 	return -ENOIOCTLCMD;