bgpd: Fix value stored to group never being read

SA Reports:

bgpd/bgp_rpki.c:1085:24: warning: Value stored to 'group' during its initialization is never read [deadcode.DeadStores]
        struct rtr_mgr_group *group = get_connected_group(rpki_vrf);
                              ^~~~~   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

bgpd/bgp_rpki.c

@@ -1082,7 +1082,7 @@ static void print_prefix_table(struct vty *vty, struct rpki_vrf *rpki_vrf,
 
 	unsigned int number_of_ipv4_prefixes = 0;
 	unsigned int number_of_ipv6_prefixes = 0;
-	struct rtr_mgr_group *group = get_connected_group(rpki_vrf);
+	struct rtr_mgr_group *group;
 	json_object *json_records = NULL;
 
 	if (!rpki_vrf)