net: fix for assert on enabling socket CAN

Socket CAN does not require interface link address to be
assigned, check is not applicable for socket CAN
interfaces. As this address is NULL for socket CAN interface
it results in assertion.

Signed-off-by: Ramesh Babu B <[email protected]>

Author: rbabub

subsys/net/ip/net_if.c

@@ -3990,7 +3990,15 @@ int net_if_up(struct net_if *iface)
 	/* In many places it's assumed that link address was set with
 	 * net_if_set_link_addr(). Better check that now.
 	 */
-	NET_ASSERT(net_if_get_link_addr(iface)->addr != NULL);
+#if defined(CONFIG_NET_L2_CANBUS_RAW)
+	if (IS_ENABLED(CONFIG_NET_SOCKETS_CAN) &&
+	    (net_if_l2(iface) == &NET_L2_GET_NAME(CANBUS_RAW)))	{
+		/* CAN does not require link address. */
+	} else
+#endif	/* CONFIG_NET_L2_CANBUS_RAW */
+	{
+		NET_ASSERT(net_if_get_link_addr(iface)->addr != NULL);
+	}
 
 	net_if_flag_set(iface, NET_IF_UP);