gbproxy: Delete gbproxy_nse in delete-gbproxy-peer VTY command

The gbproxy_nse is created when the signalling BVC is resetted. When
we delete all bvcs of an nsei we need to remove it as well.

Change-Id: I997b29fef93188565f81bd403bc68840473958c3
Related: SYS#5002
diff --git a/src/gb_proxy_vty.c b/src/gb_proxy_vty.c
index 379b8c2..bf1c4e0 100644
--- a/src/gb_proxy_vty.c
+++ b/src/gb_proxy_vty.c
@@ -696,9 +696,11 @@
 		delete_bvc = delete_nsvc = 1;
 
 	if (delete_bvc) {
-		if (!dry_run)
+		if (!dry_run) {
+			struct gbproxy_nse *nse = gbproxy_nse_by_nsei(g_cfg, nsei);
 			counter = gbproxy_cleanup_peers(g_cfg, nsei, 0);
-		else {
+			gbproxy_nse_free(nse);
+		} else {
 			struct gbproxy_nse *nse;
 			struct gbproxy_peer *peer;
 			counter = 0;