LU-13950 lnet: do not crash if lnet_sock_getaddr returns error

LU-13950 lnet: do not crash if lnet_sock_getaddr returns error

Some issues with network lead to panic in ksocknal_accept

rc = lnet_sock_getaddr(sock, true, &peer_ip, &peer_port);
LASSERT(rc == 0); /* we succeeded before */

Let's pass this error to the caller.

Change-Id: I34d43c19b4e75422db50e7abb02cac3510882b0d
hpe-bug-id: LUS-9256
Signed-off-by: Artem Blagodarenko <artem.blagodarenko@hpe.com>
Reviewed-on: https://es-gerrit.dev.cray.com/157753
Reviewed-by: Andriy Skulysh <c17819@cray.com>
Reviewed-by: Alexander Zarochentsev <c17826@cray.com>
Tested-by: Alexander Lezhoev <c17454@cray.com>
Reviewed-by: Chris Horn <hornc@cray.com>
Reviewed-on: https://review.whamcloud.com/39834
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Oleg Drokin <green@whamcloud.com>