hw/xive.c: Fix memcmp() in DEBUG build to compare struct not ptr
hw/xive.c: Fix memcmp() in DEBUG build to compare struct not ptr

With GCC9:

hw/xive.c: In function ‘xive_check_eq_update’:
hw/xive.c:3034:29: error: argument to ‘sizeof’ in ‘__builtin_memcmp’ call is the same expression as the first source; did you mean to dereference it? [-Werror=sizeof-pointer-memaccess]
  if (memcmp(eq, &eq2, sizeof(eq)) != 0) {
                             ^
hw/xive.c: In function ‘xive_check_vpc_update’:
hw/xive.c:3056:29: error: argument to ‘sizeof’ in ‘__builtin_memcmp’ call is the same expression as the first source; did you mean to dereference it? [-Werror=sizeof-pointer-memaccess]
  if (memcmp(vp, &vp2, sizeof(vp)) != 0) {
                             ^
cc1: all warnings being treated as errors

Fixes: 2eea386767728
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.ibm.com>

open-power/skiboot,shenki/skiboot,legoater/skiboot,shenki/skiboot,open-power/skiboot,legoater/skiboot,shenki/skiboot,open-power/skiboot,open-power/skiboot,legoater/skiboot,shenki/skiboot,open-power/skiboot,qemu/skiboot,shenki/skiboot,legoater/skiboot,qemu/skiboot,qemu/skiboot,qemu/skiboot,stewart-ibm/skiboot,stewart-ibm/skiboot,stewart-ibm/skiboot,qemu/skiboot,legoater/skiboot