qemu: domcaps: Initialize all features

While the qemu driver currently implements all domain capability
features, we should initialize all features using the helper similarly
to how we do it in drivers which don't support any.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/qemu/qemu_capabilities.c

@@ -5571,6 +5571,8 @@ virQEMUCapsFillDomainCaps(virCapsPtr caps,
     virDomainCapsDeviceVideoPtr video = &domCaps->video;
     virDomainCapsDeviceRNGPtr rng = &domCaps->rng;
 
+    virDomainCapsFeaturesInitUnsupported(domCaps);
+
     domCaps->maxvcpus = virQEMUCapsGetMachineMaxCpus(qemuCaps,
                                                      domCaps->machine);
     if (domCaps->virttype == VIR_DOMAIN_VIRT_KVM) {