gnss: update gnss fw download code

Change-Id: Iaba40436629ee6ff4b63961d697eeb27ced814c2
diff --git a/mbtk/mbtk_gnssd/hd8122_dl/fwup.c b/mbtk/mbtk_gnssd/hd8122_dl/fwup.c
index 16b30a5..9b667cf 100755
--- a/mbtk/mbtk_gnssd/hd8122_dl/fwup.c
+++ b/mbtk/mbtk_gnssd/hd8122_dl/fwup.c
@@ -466,7 +466,7 @@
 

 	//uart_send((uint8_t *)cmdCFGRST, 9);

 	HDBD_LOG("[%s %d] upgrade success!\n", __FUNCTION__, __LINE__);

-	return 1;

+	return 0;

 }