Fix memory leak on libvirt_list_domains()
Fix memory leak on libvirt_list_domains()

This is the patch to fix the memory leak on libvirt_list_domains()
to free the domain pointers once they are no longer necessary.

Signed-off-by: Yukihiro Kawada <1895259d870f7c838c6445591fc59ec6e3c0bd7e@gmail.com>

php/pecl-virtualization-libvirt,zippy2/libvirt-php,libvirt/libvirt-php,zippy2/libvirt-php,tucksaun/libvirt-php,martijnotto/libvirt-php,php/pecl-virtualization-libvirt,vtolstov/libvirt-php,tucksaun/libvirt-php,libvirt/libvirt-php,martijnotto/libvirt-php,KnightSwarm/libvirt-php,KnightSwarm/libvirt-php,zippy2/libvirt-php,vtolstov/libvirt-php,martijnotto/libvirt-php,php/pecl-virtualization-libvirt,martijnotto/libvirt-php,tucksaun/libvirt-php,libvirt/libvirt-php,tucksaun/libvirt-php,KnightSwarm/libvirt-php,KnightSwarm/libvirt-php,vtolstov/libvirt-php,php/pecl-virtualization-libvirt,vtolstov/libvirt-php,KnightSwarm/libvirt-php