bgpd: Allow peer-groups to have ttl-security hops configured

The command `neighbor PGROUP ttl-security hops X` was being
accepted but ignored.  Allow it to be stored.  I am still
not sure that this is applied correctly, but that is another
problem.

Fixes: FRRouting#7848
Signed-off-by: Donald Sharp <sharpd@nvidia.com>

bgpd/bgpd.c

@@ -7150,6 +7150,7 @@ int is_ebgp_multihop_configured(struct peer *peer)
 int peer_ttl_security_hops_set(struct peer *peer, int gtsm_hops)
 {
 	struct peer_group *group;
+	struct peer *gpeer;
 	struct listnode *node, *nnode;
 	int ret;
 
@@ -7186,9 +7187,10 @@ int peer_ttl_security_hops_set(struct peer *peer, int gtsm_hops)
 				return ret;
 		} else {
 			group = peer->group;
+			group->conf->gtsm_hops = gtsm_hops;
 			for (ALL_LIST_ELEMENTS(group->peer, node, nnode,
-					       peer)) {
-				peer->gtsm_hops = group->conf->gtsm_hops;
+					       gpeer)) {
+				gpeer->gtsm_hops = group->conf->gtsm_hops;
 
 				/* Calling ebgp multihop also resets the
 				 * session.
@@ -7198,7 +7200,7 @@ int peer_ttl_security_hops_set(struct peer *peer, int gtsm_hops)
 				 * value is
 				 * irrelevant.
 				 */
-				peer_ebgp_multihop_set(peer, MAXTTL);
+				peer_ebgp_multihop_set(gpeer, MAXTTL);
 			}
 		}
 	} else {