input_manager: fix potential memory leak on text

Fix potential memory leak when controller_push_event failed.

Signed-off-by: yuchenlin <npes87184@gmail.com>

app/src/input_manager.c

@@ -144,6 +144,7 @@ void input_manager_process_text_input(struct input_manager *input_manager,
         return;
     }
     if (!controller_push_event(input_manager->controller, &control_event)) {
+        SDL_free(control_event.text_event.text);
         LOGW("Cannot send text event");
     }
 }