setitimer with NULL

[Mark Kelly]

I saw this kernel message:

xsel calls setitimer() with new_value NULL pointer. Misfeature support will be removed

Not sure if it matters much or not but thought I'd log it.
I'll look through the code and see if anything should be changed.

[Mark Kelly]

See PR #31

[Mark Kelly]

Closing as this is now resolved with PR #31 that was merged.
Thank you for @kfish for xsel !