ns2: ns2_recv_vc: remove unused parameter nsi

Change-Id: I0dbc079e83d37de01a4260442363ed5fdcd51d28
diff --git a/src/gb/gprs_ns2_internal.h b/src/gb/gprs_ns2_internal.h
index 708eb59..15b0bc5 100644
--- a/src/gb/gprs_ns2_internal.h
+++ b/src/gb/gprs_ns2_internal.h
@@ -203,8 +203,7 @@
 			       struct msgb **reject,
 			       struct gprs_ns2_vc **success);
 
-int ns2_recv_vc(struct gprs_ns2_inst *nsi,
-		struct gprs_ns2_vc *nsvc,
+int ns2_recv_vc(struct gprs_ns2_vc *nsvc,
 		struct msgb *msg);
 
 struct gprs_ns2_vc *ns2_vc_alloc(struct gprs_ns2_vc_bind *bind,