cosmetic: msc_vlr_tests: drop unused var

Change-Id: I584c0dfffe005597563dbd72fad8a087c554ba3d
diff --git a/tests/msc_vlr/msc_vlr_tests.c b/tests/msc_vlr/msc_vlr_tests.c
index 3966aac..71f9713 100644
--- a/tests/msc_vlr/msc_vlr_tests.c
+++ b/tests/msc_vlr/msc_vlr_tests.c
@@ -454,7 +454,6 @@
 
 int _validate_dtap(struct msgb *msg, enum ran_type to_ran)
 {
-	struct gsm48_hdr *gh = (void*)msg->data;
 	btw("DTAP --%s--> MS: %s: %s",
 	    ran_type_name(to_ran), msg_type_name(msg),
 	    osmo_hexdump_nospc(msg->data, msg->len));