misc: Fix the return type of the go back vty function...
Without this we will get warnings about incompatible assignments
diff --git a/openbsc/src/gprs/sgsn_main.c b/openbsc/src/gprs/sgsn_main.c
index 6338f70..27d156a 100644
--- a/openbsc/src/gprs/sgsn_main.c
+++ b/openbsc/src/gprs/sgsn_main.c
@@ -125,7 +125,7 @@
extern struct gprs_ns_inst *bssgp_nsi;
extern void *tall_msgb_ctx;
-extern int bsc_vty_go_parent(struct vty *vty);
+extern enum node_type bsc_vty_go_parent(struct vty *vty);
static struct vty_app_info vty_info = {
.name = "Osmocom SGSN",