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/mgcp/mgcp_main.c b/openbsc/src/mgcp/mgcp_main.c
index 3ccd734..d5b6502 100644
--- a/openbsc/src/mgcp/mgcp_main.c
+++ b/openbsc/src/mgcp/mgcp_main.c
@@ -174,7 +174,7 @@
 	return 0;
 }
 
-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 		= "OpenBSC MGCP",