net: ethernet: remove unused family variable

Remove unused family variable from receive function in ethernet layer 2.
It is checked only once under such conditions, that do not allow the
variable to be different.

Signed-off-by: Cla Mattia Galliard <[email protected]>

subsys/net/l2/ethernet/ethernet.c

@@ -240,7 +240,6 @@ static enum net_verdict ethernet_recv(struct net_if *iface,
 	uint8_t hdr_len = sizeof(struct net_eth_hdr);
 	uint16_t type;
 	struct net_linkaddr *lladdr;
-	sa_family_t family = AF_UNSPEC;
 	bool is_vlan_pkt = false;
 
 	/* This expects that the Ethernet header is in the first net_buf
@@ -315,18 +314,14 @@ static enum net_verdict ethernet_recv(struct net_if *iface,
 	case NET_ETH_PTYPE_IP:
 	case NET_ETH_PTYPE_ARP:
 		net_pkt_set_family(pkt, AF_INET);
-		family = AF_INET;
 		break;
 	case NET_ETH_PTYPE_IPV6:
 		net_pkt_set_family(pkt, AF_INET6);
-		family = AF_INET6;
 		break;
 	case NET_ETH_PTYPE_EAPOL:
-		family = AF_UNSPEC;
 		break;
 #if defined(CONFIG_NET_L2_PTP)
 	case NET_ETH_PTYPE_PTP:
-		family = AF_UNSPEC;
 		break;
 #endif
 	case NET_ETH_PTYPE_LLDP:
@@ -339,7 +334,6 @@ static enum net_verdict ethernet_recv(struct net_if *iface,
 #endif
 	default:
 		if (IS_ENABLED(CONFIG_NET_ETHERNET_FORWARD_UNRECOGNISED_ETHERTYPE)) {
-			family = AF_UNSPEC;
 			break;
 		}
 
@@ -398,8 +392,7 @@ static enum net_verdict ethernet_recv(struct net_if *iface,
 
 	ethernet_update_rx_stats(iface, hdr, net_pkt_get_len(pkt) + hdr_len);
 
-	if (IS_ENABLED(CONFIG_NET_ARP) &&
-	    family == AF_INET && type == NET_ETH_PTYPE_ARP) {
+	if (IS_ENABLED(CONFIG_NET_ARP) && type == NET_ETH_PTYPE_ARP) {
 		NET_DBG("ARP packet from %s received",
 			net_sprint_ll_addr((uint8_t *)hdr->src.addr,
 					   sizeof(struct net_eth_addr)));