lib/persistentqueue/persistentqueue.go: remove fs.MustSyncPath() call after fs.MustWriteSync()

The fs.MustWriteSync() already fsyncs the created file, so there is no need in additional fsync() call.

While at it, add missing fsync for the parent directory after creating a directory for persistent queue.

lib/persistentqueue/persistentqueue.go

@@ -178,6 +178,7 @@ func tryOpeningQueue(path, name string, chunkFileSize, maxBlockSize, maxPendingB
 			fs.MustClose(q.flockF)
 		}
 	}()
+	fs.MustSyncPathAndParentDir(path)
 
 	// Read metainfo.
 	var mi metainfo
@@ -643,7 +644,6 @@ func (mi *metainfo) WriteToFile(path string) error {
 		return fmt.Errorf("cannot marshal persistent queue metainfo %#v: %w", mi, err)
 	}
 	fs.MustWriteSync(path, data)
-	fs.MustSyncPath(path)
 	return nil
 }