[Bug 214735] Add ENODATA to errno.h

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214735

--- Comment #3 from Willem Jan Withagen <[email protected]> ---
I would advise against using a different number for this define....
The reason for adding it is make "Linux originated code" compile easier.

Ceph has a lot of places where is does:
  if (func() == ENODATA) { repair or report; }

Giving it a different value from ENOATTR will not fix the challenge since now:
  - the code compiles
  - but the test fails, because ENODATA != ENOATTR
  - porter gets to chase down errors in code that runs but fails in weird
places

So fixing it wrongly is worse than just closing this bug-report.

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