Fix code warning.

Change-Id: Ib11fb49f528d3688351ae349d5b4e307c28b3967
diff --git a/mbtk/test/others/mbtk_gnss_cli.c b/mbtk/test/others/mbtk_gnss_cli.c
index 8699a39..825d501 100755
--- a/mbtk/test/others/mbtk_gnss_cli.c
+++ b/mbtk/test/others/mbtk_gnss_cli.c
@@ -27,6 +27,7 @@
 #include "mbtk_log.h"
 #include "mbtk_type.h"
 #include "mbtk_gnss.h"
+#include "mbtk_utils.h"
 
 #define GNSS_SOCK_PATH "/tmp/mbtk_gnss_sock"
 
@@ -81,15 +82,15 @@
     } else if(cmd == GNSS_CMD_DEINIT) {
         sprintf(buff, "gnss_deinit");
     } else if(cmd == GNSS_CMD_SETTING) {
-        sprintf(buff, "gnss_setting:%s", arg);
+        sprintf(buff, "gnss_setting:%s", (char*)arg);
     } else if(cmd == GNSS_CMD_DL) {
-        sprintf(buff, "gnss_dl:%s", arg);
+        sprintf(buff, "gnss_dl:%s", (char*)arg);
     } else {
         printf("Unknown cmd.\n");
         return -1;
     }
 
-    write(sock_listen_fd, buff, strlen(buff));
+    mbtk_write(sock_listen_fd, buff, strlen(buff));
 
     int len = 0;
     char *rsp = NULL;