qemu: cgroup: Remove abandoned function qemuAddToCgroup

This function doesn't do anything useful since 2049ef99.

src/qemu/qemu_cgroup.c

@@ -1100,14 +1100,3 @@ qemuRemoveCgroup(virDomainObjPtr vm)
 
     return virCgroupRemove(priv->cgroup);
 }
-
-int
-qemuAddToCgroup(virDomainObjPtr vm)
-{
-    qemuDomainObjPrivatePtr priv = vm->privateData;
-
-    if (priv->cgroup == NULL)
-        return 0; /* Not supported, so claim success */
-
-    return 0;
-}

src/qemu/qemu_cgroup.h

@@ -55,6 +55,5 @@ int qemuSetupCgroupVcpuBW(virCgroupPtr cgroup,
 int qemuSetupCgroupCpusetCpus(virCgroupPtr cgroup, virBitmapPtr cpumask);
 int qemuSetupCgroupForEmulator(virDomainObjPtr vm);
 int qemuRemoveCgroup(virDomainObjPtr vm);
-int qemuAddToCgroup(virDomainObjPtr vm);
 
 #endif /* __QEMU_CGROUP_H__ */