joyent/node — pull request #6707 by fardjad (2013-12-14 22:04:21+00:00)
Title: fs: move makeCallback and maybeCallback to util

`makeCallback()`, `maybeCallback()`, and `rethrow()` declared in **fs** can also be used in other places.

Related to [#6225](https://github.com/joyent/node/issues/6525)

PS:
I already signed the CLA.