Fix gnss arg check.

Change-Id: I86d8eb34a192a25789587a96675a60132d3b67c9
diff --git a/mbtk/mbtk_gnssd/gnss_main.c b/mbtk/mbtk_gnssd/gnss_main.c
index 1966855..cfceb1a 100755
--- a/mbtk/mbtk_gnssd/gnss_main.c
+++ b/mbtk/mbtk_gnssd/gnss_main.c
@@ -73,15 +73,18 @@
 static int arg_check(int argc, char *argv[])
 {
     if(argc != 4) {
+        LOGE("argc = %d", argc);
         goto check_fail;
     }
 
     // Only support 6228/8122/5311.
     if(strcmp(argv[1], GNSS_ID_6228) && strcmp(argv[1], GNSS_ID_8122) && strcmp(argv[1], GNSS_ID_5311)) {
+        LOGE("argv[1] = %s", argv[1]);
         goto check_fail;
     }
 
     if(access(argv[2], R_OK | W_OK)) {
+        LOGE("access(%s) rw fail. ", argv[2]);
         goto check_fail;
     }