server/server: Remove all connections on shutdown

This patch fixes a memory leak in the internal server. Steps for
reproduction:

 * valgrind --leak-check=full --show-reachable=yes ./build/src/openocd
 * Establish more than one connection to OpenOCD (e.g. telnet)
 * Shutdown OpenOCD
 * Check for memory leaks in add_connection()

Change-Id: I0ae6fcf2918fd9bdec350446d3e26742d08ff698
Signed-off-by: Marc Schink <openocd-dev@marcschink.de>

src/server/server.c

@@ -351,6 +351,21 @@ int add_service(char *name,
 	return ERROR_OK;
 }
 
+static void remove_connections(struct service *service)
+{
+	struct connection *connection;
+
+	connection = service->connections;
+
+	while (connection) {
+		struct connection *tmp;
+
+		tmp = connection->next;
+		remove_connection(service, connection);
+		connection = tmp;
+	}
+}
+
 static int remove_services(void)
 {
 	struct service *c = services;
@@ -359,6 +374,8 @@ static int remove_services(void)
 	while (c) {
 		struct service *next = c->next;
 
+		remove_connections(c);
+
 		if (c->name)
 			free(c->name);