Recent patch to support UDP encapsulation introduced problem with
handling inbound IPv6 packets with header extensions.
This patch aims to fix the issue.

Bugzilla ID: 695
Fixes: 9a1cc8f1ed74 ("examples/ipsec-secgw: support UDP encapsulation")

Reported-by: Vladimir Medvedkin <redacted>
Signed-off-by: Konstantin Ananyev <redacted>
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Acked-by: Akhil Goyal <redacted>

Applied to dpdk-next-crypto

Thanks.