Fix warnings from the Clang static analyzer.

These are all false positives or harmless dead stores.

src/net.c

@@ -94,7 +94,8 @@ void purge(void) {
 void terminate_connection(connection_t *c, bool report) {
 	logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Closing connection with %s (%s)", c->name, c->hostname);
 
-	if(c->node && c->node->connection == c)
+	if(c->node) {
+		if(c->node->connection == c)
 			c->node->connection = NULL;
 
 		if(c->edge) {
@@ -120,6 +121,7 @@ void terminate_connection(connection_t *c, bool report) {
 				}
 			}
 		}
+	}
 
 	outgoing_t *outgoing = c->outgoing;
 	connection_del(c);

src/net_packet.c

@@ -767,7 +767,7 @@ bool send_sptps_data(node_t *to, node_t *from, int type, const void *data, size_
 			char buf[len + sizeof to->id + sizeof from->id]; char* buf_ptr = buf;
 			memcpy(buf_ptr, &to->id, sizeof to->id); buf_ptr += sizeof to->id;
 			memcpy(buf_ptr, &from->id, sizeof from->id); buf_ptr += sizeof from->id;
-			memcpy(buf_ptr, data, len); buf_ptr += len;
+			memcpy(buf_ptr, data, len);
 			logger(DEBUG_TRAFFIC, LOG_INFO, "Sending packet from %s (%s) to %s (%s) via %s (%s) (TCP)", from->name, from->hostname, to->name, to->hostname, to->nexthop->name, to->nexthop->hostname);
 			return send_sptps_tcppacket(to->nexthop->connection, buf, sizeof buf);
 		}

src/net_socket.c

@@ -534,6 +534,8 @@ begin:
 	} else if(proxytype == PROXY_EXEC) {
 		result = 0;
 	} else {
+		if(!proxyai)
+			abort();
 		result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
 		freeaddrinfo(proxyai);
 	}

src/sptps.c

@@ -547,8 +547,6 @@ size_t sptps_receive_data(sptps_t *s, const void *data, size_t len) {
 	memcpy(s->inbuf + s->buflen, data, toread);
 	total_read += toread;
 	s->buflen += toread;
-	len -= toread;
-	data += toread;
 
 	// If we don't have a whole record, exit.
 	if(s->buflen < s->reclen + (s->instate ? 19UL : 3UL))