[qca-nss-ecm] Use correct fields for ip addresses

When there is no ct entry with the skb use the correct fields from
ip_hdr to obtain the addresess.
Do not use the temp buffer structures in the ip_hdr as these
may not be used if the header is not fragmented.

CRs-Fixed: 829533

Change-Id: I68509b651c1a1eddb66bb34b5165ad3ece156c48
Signed-off-by: Gareth Williams <garethw@codeaurora.org>
3 files changed