keyboard: free stuff on exit

This fixes a bunch of leaks when trying to run a Weston test with
desktop-shell, which spawns weston-keyboard.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

clients/keyboard.c

@@ -1011,6 +1011,20 @@ keyboard_create(struct virtual_keyboard *virtual_keyboard)
 					     display_output_handler);
 }
 
+static void
+keyboard_destroy(struct virtual_keyboard *virtual_keyboard)
+{
+	if (virtual_keyboard->input_panel)
+		zwp_input_panel_v1_destroy(virtual_keyboard->input_panel);
+
+	if (virtual_keyboard->input_method)
+		zwp_input_method_v1_destroy(virtual_keyboard->input_method);
+
+	widget_destroy(virtual_keyboard->keyboard->widget);
+	window_destroy(virtual_keyboard->keyboard->window);
+	free(virtual_keyboard->keyboard);
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -1037,5 +1051,8 @@ main(int argc, char *argv[])
 
 	display_run(virtual_keyboard.display);
 
+	keyboard_destroy(&virtual_keyboard);
+	display_destroy(virtual_keyboard.display);
+
 	return 0;
 }