testCompareMemLock: Use correct free function for domain def
testCompareMemLock: Use correct free function for domain def

virDomainDef is not an instance of virObject thus
virObjectUnref() is not the correct function to be called.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

fabianfreyer/libvirt,eskultety/libvirt,crobinso/libvirt,andreabolognani/libvirt,olafhering/libvirt,olafhering/libvirt,eskultety/libvirt,nertpinx/libvirt,zippy2/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,nertpinx/libvirt,libvirt/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,olafhering/libvirt,libvirt/libvirt,andreabolognani/libvirt,jardasgit/libvirt,olafhering/libvirt,jfehlig/libvirt,zippy2/libvirt,jfehlig/libvirt,crobinso/libvirt,jardasgit/libvirt,eskultety/libvirt,jfehlig/libvirt,andreabolognani/libvirt,nertpinx/libvirt,eskultety/libvirt,crobinso/libvirt,libvirt/libvirt,eskultety/libvirt,zippy2/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,jardasgit/libvirt,nertpinx/libvirt,zippy2/libvirt,libvirt/libvirt,fabianfreyer/libvirt,crobinso/libvirt,andreabolognani/libvirt