diff --git a/driver-icarus.c b/driver-icarus.c
index 63d86b88..850b65a5 100644
--- a/driver-icarus.c
+++ b/driver-icarus.c
@@ -330,6 +330,9 @@ static int icarus_get_nonce(struct cgpu_info *icarus, unsigned char *buf, struct
 
 	cgtime(tv_start);
 	while (true) {
+		if (icarus->usbinfo.nodev)
+			return ICA_NONCE_ERROR;
+
 		cgtime(&read_start);
 		err = usb_read_timeout(icarus, (char *)buf, read_amount, &amt, ICARUS_WAIT_TIMEOUT, C_GETRESULTS);
 		cgtime(&read_finish);
diff --git a/usbutils.c b/usbutils.c
index 72b66e4d..36de7cbe 100644
--- a/usbutils.c
+++ b/usbutils.c
@@ -1279,8 +1279,6 @@ static struct cg_usb_device *free_cgusb(struct cg_usb_device *cgusb)
 
 void usb_uninit(struct cgpu_info *cgpu)
 {
-	int err;
-
 	applog(LOG_DEBUG, "USB uninit %s%i",
 			cgpu->drv->name, cgpu->device_id);
 
@@ -1288,7 +1286,7 @@ void usb_uninit(struct cgpu_info *cgpu)
 	//  if release_cgpu() was called due to a USB NODEV(err)
 	if (!cgpu->usbdev)
 		return;
-	err = libusb_release_interface(cgpu->usbdev->handle, cgpu->usbdev->found->interface);
+	libusb_release_interface(cgpu->usbdev->handle, cgpu->usbdev->found->interface);
 	libusb_close(cgpu->usbdev->handle);
 	cgpu->usbdev = free_cgusb(cgpu->usbdev);
 }