LWIP_VLAN_PCP==1: initialize tci correctly (disabled); add pcb_tci_*() functions to access the tci

src/core/raw.c

@@ -610,6 +610,7 @@ raw_new(u8_t proto)
 #if LWIP_MULTICAST_TX_OPTIONS
     raw_set_multicast_ttl(pcb, RAW_TTL);
 #endif /* LWIP_MULTICAST_TX_OPTIONS */
+    pcb_tci_init(pcb);
     pcb->next = raw_pcbs;
     raw_pcbs = pcb;
   }

src/core/tcp.c

@@ -1929,6 +1929,7 @@ tcp_alloc(u8_t prio)
     pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
     pcb->keep_cnt   = TCP_KEEPCNT_DEFAULT;
 #endif /* LWIP_TCP_KEEPALIVE */
+    pcb_tci_init(pcb);
   }
   return pcb;
 }

src/core/udp.c

@@ -1238,6 +1238,7 @@ udp_new(void)
 #if LWIP_MULTICAST_TX_OPTIONS
     udp_set_multicast_ttl(pcb, UDP_TTL);
 #endif /* LWIP_MULTICAST_TX_OPTIONS */
+    pcb_tci_init(pcb);
   }
   return pcb;
 }