UnionFs: insert all readdir entries directly into the channel.

unionfs/unionfs.go

@@ -644,8 +644,7 @@ func (me *UnionFs) OpenDir(directory string) (stream chan fuse.DirEntry, status
 		results[_READONLY] = 0, false
 	}
 
-	stream = make(chan fuse.DirEntry)
-	go func() {
+	stream = make(chan fuse.DirEntry, len(results))
 	for k, v := range results {
 		stream <- fuse.DirEntry{
 			Name: k,
@@ -653,7 +652,6 @@ func (me *UnionFs) OpenDir(directory string) (stream chan fuse.DirEntry, status
 		}
 	}
 	close(stream)
-	}()
 	return stream, fuse.OK
 }