libipsec: Fix compiler warning with GCC 9

The compiler complains that "taking address of packed member ... of
class or structure 'ip6_hdr' may result in an unaligned pointer value".
We don't care if the address is aligned as we explicitly use untoh16()
to convert the read value.

diff --git a/src/libipsec/ip_packet.c b/src/libipsec/ip_packet.c
index fee70c1954d0188cb23bf5ceaa1ee37de8693f9f..f4f3358cc091749e8acfbbae9df0ee9015591c97 100644 (file)
--- a/src/libipsec/ip_packet.c
+++ b/src/libipsec/ip_packet.c
@@ -335,7 +335,7 @@ ip_packet_t *ip_packet_create(chunk_t packet)
                        }
                        ip = (struct ip6_hdr*)packet.ptr;
                        /* remove any RFC 4303 TFC extra padding */
-                       packet.len = min(packet.len, 40 + untoh16(&ip->ip6_plen));
+                       packet.len = min(packet.len, 40 + untoh16((void*)&ip->ip6_plen));
                        if (!parse_transport_header_v6(ip, packet, &payload, &next_header,
                                                                                   &sport, &dport))
                        {