qemuDomainGetResctrlMonData: Don't leak @caps

The capabilities object must be unrefed when no longer needed.
Use VIR_AUTOUNREF() for that.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_driver.c

@@ -20737,7 +20737,7 @@ qemuDomainGetResctrlMonData(virQEMUDriverPtr driver,
     virDomainResctrlDefPtr resctrl = NULL;
     virQEMUResctrlMonDataPtr res = NULL;
     char **features = NULL;
-    virCapsPtr caps = NULL;
+    VIR_AUTOUNREF(virCapsPtr) caps = NULL;
     size_t i = 0;
     size_t j = 0;