Fix passing array to virNodeGetFreePages
Fix passing array to virNodeGetFreePages

We must pass the address of the first element, not the address of the
slice.

Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

libvirt/libvirt-go,libvirt/libvirt-go,libvirt/libvirt-go,libvirt/libvirt-go