Fix warning as error for V2

Change-Id: I70cfd971fda629011ba1be84fef15afea196d393
diff --git a/mbtk/mbtk_rild_v2/src/ril_dev.c b/mbtk/mbtk_rild_v2/src/ril_dev.c
index 0fe2d2f..4d267de 100755
--- a/mbtk/mbtk_rild_v2/src/ril_dev.c
+++ b/mbtk/mbtk_rild_v2/src/ril_dev.c
@@ -221,7 +221,7 @@
 static int req_volte_get(int *state, int *cme_err)
 {
     ATResponse *response = NULL;
-    char *tmp_ptr = NULL;
+//    char *tmp_ptr = NULL;
     int err = at_send_command_singleline("AT+ACONFIG?", "", &response);
 
     if (err < 0 || response->success == 0 || !response->p_intermediates){