bgpd: check bgp evpn instance presence in soo

bgpd: check bgp evpn instance presence in soo

    (pi=pi@entry=0x55e86ec1a5a0, evp=evp@entry=0x7fff4edc2160)
    at bgpd/bgp_evpn.c:3623
3623    bgpd/bgp_evpn.c: No such file or directory.
(gdb) info locals
bgp_evpn = 0x0
macvrf_soo = <optimized out>
ret = false
__func__ = <optimized out>

	(pi=pi@entry=0x55e86ec1a5a0, evp=evp@entry=0x7fff4edc2160)
    at bgpd/bgp_evpn.c:3623
	(bgp=bgp@entry=0x55e86e9cd010, afi=afi@entry=AFI_L2VPN,
    safi=safi@entry=SAFI_EVPN, p=p@entry=0x0,
	pi=pi@entry=0x55e86ec1a5a0, import=import@entry=1,
	in_vrf_rt=true,
    in_vni_rt=true) at bgpd/bgp_evpn.c:4200
	(import=1, pi=pi@entry=0x55e86ec1a5a0, p=p@entry=0x0,
    safi=safi@entry=SAFI_EVPN, afi=afi@entry=AFI_L2VPN,
	bgp=bgp@entry=0x55e86e9cd010) at bgpd/bgp_evpn.c:6266
	afi=afi@entry=AFI_L2VPN, safi=safi@entry=SAFI_EVPN,
    p=p@entry=0x7fff4edc2160, pi=pi@entry=0x55e86ec1a5a0)
	at bgpd/bgp_evpn.c:6266
	(peer=peer@entry=0x55e86ea35400, p=p@entry=0x7fff4edc2160,
    addpath_id=addpath_id@entry=0, attr=attr@entry=0x7fff4edc4400,
	afi=afi@entry=AFI_L2VPN, safi=<optimized out>,
    safi@entry=SAFI_EVPN, type=9, sub_type=0, prd=0x7fff4edc2120,
	label=0x7fff4edc211c, num_labels=1,
    soft_reconfig=0, evpn=0x7fff4edc2130) at bgpd/bgp_route.c:4805
	(peer=peer@entry=0x55e86ea35400, afi=afi@entry=AFI_L2VPN,
    safi=safi@entry=SAFI_EVPN, attr=attr@entry=0x7fff4edc4400,
	pfx=<optimized out>, psize=psize@entry=34,
    addpath_id=0) at bgpd/bgp_evpn.c:4922
	(peer=0x55e86ea35400, attr=0x7fff4edc4400, packet=<optimized out>,
    withdraw=0) at bgpd/bgp_evpn.c:5997
	(peer=peer@entry=0x55e86ea35400, attr=attr@entry=0x7fff4edc4400,
    packet=packet@entry=0x7fff4edc43d0,
	mp_withdraw=mp_withdraw@entry=0) at bgpd/bgp_packet.c:363
	(peer=peer@entry=0x55e86ea35400, size=size@entry=161)
    at bgpd/bgp_packet.c:2076
	(thread=<optimized out>) at bgpd/bgp_packet.c:2931

Ticket: #3683053

Signed-off-by: Chirag Shah <chirag@nvidia.com>