Don't free the cgpu data on shutting down avalon driver.
diff --git a/driver-avalon.c b/driver-avalon.c
index 82636e4..d10567e 100644
--- a/driver-avalon.c
+++ b/driver-avalon.c
@@ -1613,7 +1613,6 @@ static void avalon_shutdown(struct thr_info *thr)
avalon->works = NULL;
free(avalon->device_data);
avalon->device_data = NULL;
- thr->cgpu = usb_free_cgpu(avalon);
}
static char *avalon_set_device(struct cgpu_info *avalon, char *option, char *setting, char *replybuf)