nanofury: Power off device when shutting down

driver-nanofury.c

@@ -277,12 +277,21 @@ bool nanofury_init(struct thr_info * const thr)
 	return true;
 }
 
+static
+void nanofury_shutdown(struct thr_info * const thr)
+{
+	struct mcp2210_device * const mcp = thr->cgpu_data;
+	
+	nanofury_device_off(mcp);
+}
+
 struct device_drv nanofury_drv = {
 	.dname = "nanofury",
 	.name = "NFY",
 	.drv_detect = nanofury_detect,
 	
 	.thread_init = nanofury_init,
+	.thread_shutdown = nanofury_shutdown,
 	
 	.minerloop = minerloop_async,
 	.job_prepare = bitfury_job_prepare,