Reloading whitespace mode

[Gulshan Singh]

I've written a function to change a whitespace mode setting:
https://gist.github.com/gsingh93/31192604a134c868f2a2

In order to have that setting change take effect, I need to reload
whitespace-mode. I can do that manually by doing `M-x whitespace-mode`
twice, but I want to do it from elisp. Calling whitespace-mode twice in
elisp just breaks the mode.

How can I reload whitespace mode from elisp?