Add more error handling to bp2::ext cwd.ipp.

[time-killer-games]

No description provided.

[time-killer-games]

something tells me i didn't do this correctly at all :P @klemens-morgenstern

[time-killer-games]

@klemens-morgenstern also wanted to mention, procstat_freefiles(), procstat_freeprocs(), and procstat_close() all return void and seem to have no defined error reporting mentioned in the FreeBSD documentation, all the more reason for us to switch to using libkvm like I mentioned to you recently in a private message on the cpp lang slack.

For reference: https://man.freebsd.org/cgi/man.cgi?query=libprocstat&sektion=3&format=html

[klemens-morgenstern]

That looks to be correct.

[klemens-morgenstern]

Is this i a guess, or do you know this resets errno if it succeeds? Because it might just be a function that never fails.

[time-killer-games]

for other people reading this pull request who don't know what i told klemens on slack, these functions never fail and are just wrappers around the free() function, after inspecting FreeBSD's source tree for libprocstat's source code.