qemu_domain: Drop needless free from qemuDomainObjPrivateXMLParse()

qemu_domain: Drop needless free from qemuDomainObjPrivateXMLParse()

The qemuDomainObjPrivateXMLParse() is responsible for parsing
given XML into qemuDomainObjPrivate struct. As it does so, memory
might be allocated for some members. If an error occurs during
parsing the control jumps onto 'error' label where only some of
previously allocated memory is freed. The reason there's no
memory leak is simple: the only caller (virDomainObjParseXML())
unrefs freshly created virDomainObj which in turn causes
qemuDomainObjPrivateFree() to be called. Therefore, these
partial, selective frees are needless and should be just dropped.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>