vircgroup: cleanup controllers not managed by systemd on error

If virCgroupEnableMissingControllers() fails it could have already
created some directories, we should clean it up as well.
Reviewed-by: NFabiano Fidêncio <fidencio@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

src/util/vircgroup.c

@@ -1551,6 +1551,7 @@ virCgroupNewMachineSystemd(const char *name,
     int rv;
     virCgroupPtr init;
     VIR_AUTOFREE(char *) path = NULL;
+    virErrorPtr saved = NULL;
 
     VIR_DEBUG("Trying to setup machine '%s' via systemd", name);
     if ((rv = virSystemdCreateMachine(name,
@@ -1584,20 +1585,24 @@ virCgroupNewMachineSystemd(const char *name,
 
     if (virCgroupEnableMissingControllers(path, pidleader,
                                           controllers, group) < 0) {
-        return -1;
+        goto error;
     }
 
-    if (virCgroupAddTask(*group, pidleader) < 0) {
-        virErrorPtr saved = virSaveLastError();
-        virCgroupRemove(*group);
-        virCgroupFree(group);
-        if (saved) {
-            virSetError(saved);
-            virFreeError(saved);
-        }
-    }
+    if (virCgroupAddTask(*group, pidleader) < 0)
+        goto error;
 
     return 0;
+
+ error:
+    saved = virSaveLastError();
+    virCgroupRemove(*group);
+    virCgroupFree(group);
+    if (saved) {
+        virSetError(saved);
+        virFreeError(saved);
+    }
+
+    return -1;
 }