Simplify some redundant locking while unref'ing objects

There is no need to hold the mutex when unref'ing
virObject instances
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/conf/domain_conf.c

@@ -741,9 +741,7 @@ static void
 virDomainObjListDataFree(void *payload, const void *name ATTRIBUTE_UNUSED)
 {
     virDomainObjPtr obj = payload;
-    virDomainObjLock(obj);
-    if (virObjectUnref(obj))
-        virDomainObjUnlock(obj);
+    virObjectUnref(obj);
 }
 
 int virDomainObjListInit(virDomainObjListPtr doms)

src/qemu/qemu_driver.c

@@ -3556,8 +3556,8 @@ endjob:
     ignore_value(qemuDomainObjEndAsyncJob(driver, wdEvent->vm));
 
 unlock:
-    if (virObjectUnref(wdEvent->vm))
-        virDomainObjUnlock(wdEvent->vm);
+    virDomainObjUnlock(wdEvent->vm);
+    virObjectUnref(wdEvent->vm);
     qemuDriverUnlock(driver);
     VIR_FREE(wdEvent);
 }

src/rpc/virnetserver.c

@@ -191,10 +191,7 @@ static void virNetServerHandleJob(void *jobOpaque, void *opaque)
     if (virNetServerProcessMsg(srv, job->client, job->prog, job->msg) < 0)
         goto error;
 
-    virNetServerLock(srv);
     virObjectUnref(job->prog);
-    virNetServerUnlock(srv);
-
     virObjectUnref(job->client);
     VIR_FREE(job);
     return;