bgpd: flowspec default route uses vrf interface

interface whose name is "vrf name" is in the vrf with vrf_id identified
as nexthop vrf identifier. instead of parsing all vrfs, go directly to
use the appropriate one.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

bgpd/bgp_zebra.c

@@ -2985,7 +2985,7 @@ void bgp_zebra_announce_default(struct bgp *bgp, struct nexthop *nh,
 		/* create default route with interface <VRF>
 		 * with nexthop-vrf <VRF>
 		 */
-		ifp = if_lookup_by_name_all_vrf(vrf->name);
+		ifp = if_lookup_by_name(vrf->name, nh->vrf_id);
 		if (!ifp)
 			return;
 		api_nh->vrf_id = nh->vrf_id;