[nrf fromlist] net: sockets: packet: Ignore the packet type if LL add…

…ress is not set

In case the LL address is not set on a packet for any reason, don't try
to access address structure to determine packet type.

Upstream PR: zephyrproject-rtos/zephyr#69850

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>

subsys/net/lib/sockets/sockets_packet.c

@@ -144,6 +144,10 @@ static void zpacket_set_eth_pkttype(struct net_if *iface,
 				    struct sockaddr_ll *addr,
 				    struct net_linkaddr *lladdr)
 {
+	if (lladdr == NULL || lladdr->addr == NULL) {
+		return;
+	}
+
 	if (net_eth_is_addr_broadcast((struct net_eth_addr *)lladdr->addr)) {
 		addr->sll_pkttype = PACKET_BROADCAST;
 	} else if (net_eth_is_addr_multicast(