Solve the problem that the dir watcher's dbus crashed because of deadlock.

ukui-search-service-dir-manager/dirwatcher/dir-watcher.cpp

@@ -252,6 +252,7 @@ void DirWatcher::mountRemoveCallback(GVolumeMonitor *monitor, GMount *gmount, Di
     if (removedUri.startsWith("file:///")) {
         QString removedMountPoint = g_filename_from_uri(removedUri.toUtf8().constData(), nullptr, nullptr);
         pThis->m_blackListOfIndex.removeAll(removedMountPoint);
+        locker.unlock();
         QStringList indexableDirList = pThis->currentIndexableDir();
         //卸载目录下存在已索引目录时，通知索引服务删除对应目录
         for (const QString &indexableDir : indexableDirList) {
@@ -260,6 +261,7 @@ void DirWatcher::mountRemoveCallback(GVolumeMonitor *monitor, GMount *gmount, Di
             }
         }
         //处理子卷情况
+        locker.relock();
         for (auto t = pThis->m_infoOfSubvolume.constBegin(); t != pThis->m_infoOfSubvolume.constEnd(); t++) {
             if (removedMountPoint.startsWith(t.value() + "/")) {
                 pThis->m_blackListOfIndex.removeAll(removedMountPoint.replace(t.value(), t.key()));