fix: use pod name to get lock if hashVal is nil

[zwwhdls]

fix #1147

[SonglinLife]

Perhaps the StopFd should include additional code to handle an empty hashVal. If hashVal is an empty string, StopFd will remove the fs.basePath.

juicefs-csi-driver/pkg/fuse/passfd/passfd.go

Lines 139 to 147 in c545bcd

	func (fs *Fds) StopFd(ctx context.Context, podHashVal string) {
	fs.globalMu.Lock()
	f := fs.fds[podHashVal]
	if f == nil {
	serverParentPath := path.Join(fs.basePath, podHashVal)
	_ = util.DoWithTimeout(ctx, 2*time.Second, func() error {
	_, err := os.Stat(serverParentPath)
	if err == nil {
	_ = os.RemoveAll(serverParentPath)