conf: domain: Remove pointless XML node name validation in virSysinfoBIOSParseXML
conf: domain: Remove pointless XML node name validation in virSysinfoBIOSParseXML

The only caller passes 'node' argument originating from an XPath lookup
for the 'bios' element, so there's no point in checking it once more.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

jfehlig/libvirt,libvirt/libvirt,jfehlig/libvirt,jfehlig/libvirt,zippy2/libvirt,jfehlig/libvirt,olafhering/libvirt,libvirt/libvirt,zippy2/libvirt,zippy2/libvirt,olafhering/libvirt,libvirt/libvirt,zippy2/libvirt,libvirt/libvirt,olafhering/libvirt,olafhering/libvirt