tools/netmap/pkt-gen: clang error

[Harry Schmalzbauer]

 Hello,

after merging netmap code from head I can't compile pkt-gen from
usr/src/tools/tools/netmap:
cc  -O2 -pipe -Werror -Wall -Wextra -march=ivybridge  -g -std=gnu99
-fstack-protector-strong    -Qunused-arguments -Qunused-arguments 
-std=gnu99 -fstack-protector-strong    -Qunused-arguments
-Qunused-arguments  -c pkt-gen.c -o pkt-gen.o
pkt-gen.c:650:19: error: taking address of packed member 'ip' of class
or structure 'pkt' may result in an unaligned pointer value
      [-Werror,-Waddress-of-packed-member]
        struct ip *ip = &pkt->ip;
                         ^~~~~~~
pkt-gen.c:651:24: error: taking address of packed member 'udp' of class
or structure 'pkt' may result in an unaligned pointer value
      [-Werror,-Waddress-of-packed-member]
        struct udphdr *udp = &pkt->udp;
                              ^~~~~~~~
pkt-gen.c:745:8: error: taking address of packed member 'ip' of class or
structure 'pkt' may result in an unaligned pointer value
      [-Werror,-Waddress-of-packed-member]
        ip = &pkt->ip;
              ^~~~~~~
pkt-gen.c:762:9: error: taking address of packed member 'udp' of class
or structure 'pkt' may result in an unaligned pointer value
      [-Werror,-Waddress-of-packed-member]
        udp = &pkt->udp;

Quick hints highly appreciated.

Thanks,

-harry