pim6d: Don't display MLD disabled or down interfaces in "show ipv6 ml…

…d interface" cmd

We should not display down interfaces or MLD disabled interfaces in
"show ipv6 mld interface" command.

Before fix:
==========
frr# show ipv6 mld interface
Interface         State  V  Querier                    Timer               Uptime
ens192            up     2  fe80::250:56ff:feb7:d04    query 00:00:25.432  00:00:07.038
ens224            up     1  fe80::250:56ff:feb7:a7e3   query 00:00:24.219  00:00:07.031
pim6reg            down

After fix:
=========
frr# show ipv6 mld interface
Interface         State  V  Querier                    Timer               Uptime
ens192            up     2  fe80::250:56ff:feb7:d04    query 00:00:25.432  00:00:07.038
ens224            up     1  fe80::250:56ff:feb7:a7e3   query 00:00:24.219  00:00:07.031

Issue: #11241

Signed-off-by: Sarita Patra <saritap@vmware.com>

pimd/pim6_mld.c

@@ -2386,14 +2386,6 @@ static void gm_show_if_one(struct vty *vty, struct interface *ifp,
 	struct gm_if *gm_ifp = pim_ifp->mld;
 	bool querier;
 
-	if (!gm_ifp) {
-		if (js_if)
-			json_object_string_add(js_if, "state", "down");
-		else
-			vty_out(vty, "%-16s  %5s\n", ifp->name, "down");
-		return;
-	}
-
 	querier = IPV6_ADDR_SAME(&gm_ifp->querier, &pim_ifp->ll_lowest);
 
 	if (js_if) {
@@ -2437,6 +2429,7 @@ static void gm_show_if_vrf(struct vty *vty, struct vrf *vrf, const char *ifname,
 {
 	struct interface *ifp;
 	json_object *js_vrf;
+	struct pim_interface *pim_ifp;
 
 	if (js) {
 		js_vrf = json_object_new_object();
@@ -2453,8 +2446,11 @@ static void gm_show_if_vrf(struct vty *vty, struct vrf *vrf, const char *ifname,
 			continue;
 		}
 
-		if (!ifp->info)
+		pim_ifp = ifp ->info;
+
+		if (!pim_ifp || !pim_ifp->mld)
 			continue;
+
 		if (js) {
 			js_if = json_object_new_object();
 			json_object_object_add(js_vrf, ifp->name, js_if);