Reorder functions

Move functions so that they can be called from enable_tunnel() (in the
following commit).

app/src/server.c

@@ -126,6 +126,20 @@ disable_tunnel_forward(const char *serial, uint16_t local_port) {
     return process_check_success(process, "adb forward --remove");
 }
 
+static bool
+disable_tunnel(struct server *server) {
+    if (server->tunnel_forward) {
+        return disable_tunnel_forward(server->serial, server->local_port);
+    }
+    return disable_tunnel_reverse(server->serial);
+}
+
+static socket_t
+listen_on_port(uint16_t port) {
+#define IPV4_LOCALHOST 0x7F000001
+    return net_listen(IPV4_LOCALHOST, port, 1);
+}
+
 static bool
 enable_tunnel(struct server *server) {
     if (enable_tunnel_reverse(server->serial, server->local_port)) {
@@ -137,14 +151,6 @@ enable_tunnel(struct server *server) {
     return enable_tunnel_forward(server->serial, server->local_port);
 }
 
-static bool
-disable_tunnel(struct server *server) {
-    if (server->tunnel_forward) {
-        return disable_tunnel_forward(server->serial, server->local_port);
-    }
-    return disable_tunnel_reverse(server->serial);
-}
-
 static process_t
 execute_server(struct server *server, const struct server_params *params) {
     char max_size_string[6];
@@ -187,13 +193,6 @@ execute_server(struct server *server, const struct server_params *params) {
     return adb_execute(server->serial, cmd, sizeof(cmd) / sizeof(cmd[0]));
 }
 
-#define IPV4_LOCALHOST 0x7F000001
-
-static socket_t
-listen_on_port(uint16_t port) {
-    return net_listen(IPV4_LOCALHOST, port, 1);
-}
-
 static socket_t
 connect_and_read_byte(uint16_t port) {
     socket_t socket = net_connect(IPV4_LOCALHOST, port);