fix some races on pongoOS devices

src/main.c

@@ -148,6 +148,8 @@ int palera1n(int argc, char *argv[], char *envp[]) {
 											  palerain_option_device_info)
 								 ) || device_has_booted)
 		goto normal_exit;
+	pthread_cancel(pongo_thread);
+	pthread_join(pongo_thread, NULL);
 	if (exec_checkra1n()) goto cleanup;
 
 	if ((palerain_flags & (palerain_option_pongo_exit | palerain_option_demote)))

src/pongo_helper.c

@@ -42,6 +42,9 @@ void *pongo_usb_callback(stuff_t *arg) {
 	}
 #endif
 	LOG(LOG_INFO, "Found PongoOS USB Device");
+	if (palerain_flags & palerain_option_pongo_exit)
+		goto done;
+
 	usb_device_handle_t handle = arg->handle;
 #ifdef TUI
 	if (tui_is_jailbreaking) {