pahole: Consider unions when looking for classes containing some class

I.e.:

  $ pahole --contains tpacket_req
  tpacket_req_u
  $

Wasn't working, but should be considered with --contains/-i:

  $ pahole -C tpacket_req_u
  union tpacket_req_u {
  	struct tpacket_req         req;                /*     0    16 */
  	struct tpacket_req3        req3;               /*     0    28 */
  };
  $

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1 file changed