Temporary directory not deleted after close

[frabosalpit]

Hi,
after close the watcher (using watcher.close() function), the temporary directories (under /tmp/) not are delected.

Example:
drwxr-xr-x. 3 root root 38 Jun 24 20:47 node-watch-0ba541d485666
drwxr-xr-x. 3 root root 38 Jun 24 19:12 node-watch-6d95f1d58cf78
drwxr-xr-x. 3 root root 38 Jun 24 20:27 node-watch-809ef4cd1b51f
drwxr-xr-x. 3 root root 37 Jun 24 20:48 node-watch-8220603f00d6f
drwxr-xr-x. 3 root root 38 Jun 24 20:11 node-watch-95dc0f1bf31c7
drwxr-xr-x. 3 root root 38 Jun 24 19:10 node-watch-f3a51f96b6eeb

[yuanchuan]

I can't reproduce the result, but I think the directories inside /tmp should not be a problem