Fix memory leak when closing TCP connection.

Thanks to: TokTok#1216

toxcore/TCP_client.c

@@ -346,18 +346,6 @@ static _Bool add_priority(TCP_Client_Connection *con, const uint8_t *packet, uin
     return 1;
 }
 
-static void wipe_priority_list(TCP_Client_Connection *con)
-{
-    TCP_Priority_List *p = con->priority_queue_start;
-
-    while (p) {
-        TCP_Priority_List *pp = p;
-        p = p->next;
-        free(pp);
-    }
-
-}
-
 /* return 1 on success.
  * return 0 if could not send packet.
  * return -1 on failure (connection must be killed).
@@ -960,7 +948,7 @@ void kill_TCP_connection(TCP_Client_Connection *TCP_connection)
     if (TCP_connection == NULL)
         return;
 
-    wipe_priority_list(TCP_connection);
+    wipe_priority_list(TCP_connection->priority_queue_start);
     kill_sock(TCP_connection->sock);
     sodium_memzero(TCP_connection, sizeof(TCP_Client_Connection));
     free(TCP_connection);

toxcore/TCP_server.c

@@ -169,6 +169,7 @@ static int del_accepted(TCP_Server *TCP_server, int index)
     if (!bs_list_remove(&TCP_server->accepted_key_list, TCP_server->accepted_connection_array[index].public_key, index))
         return -1;
 
+    wipe_priority_list(TCP_server->accepted_connection_array[index].priority_queue_start);
     sodium_memzero(&TCP_server->accepted_connection_array[index], sizeof(TCP_Secure_Connection));
     --TCP_server->num_accepted_connections;
 
@@ -315,6 +316,15 @@ static int send_pending_data_nonpriority(TCP_Secure_Connection *con)
 
 }
 
+void wipe_priority_list(TCP_Priority_List *p)
+{
+    while (p) {
+        TCP_Priority_List *pp = p;
+        p = p->next;
+        free(pp);
+    }
+}
+
 /* return 0 if pending data was sent completely
  * return -1 if it wasn't
  */
@@ -446,6 +456,7 @@ static int write_packet_TCP_secure_connection(TCP_Secure_Connection *con, const
  */
 static void kill_TCP_connection(TCP_Secure_Connection *con)
 {
+    wipe_priority_list(con->priority_queue_start);
     kill_sock(con->sock);
     sodium_memzero(con, sizeof(TCP_Secure_Connection));
 }

toxcore/TCP_server.h

@@ -146,6 +146,8 @@ typedef struct {
 TCP_Server *new_TCP_server(uint8_t ipv6_enabled, uint16_t num_sockets, const uint16_t *ports, const uint8_t *secret_key,
                            Onion *onion);
 
+void wipe_priority_list(TCP_Priority_List *p);
+
 /* Run the TCP_server
  */
 void do_TCP_server(TCP_Server *TCP_server);