[sudo-workers] Output symbolic name of limit in warnings

[Todd C. Miller]

On Wed, 18 Dec 2019 18:08:33 +0200, Kimmo Suominen wrote:

> I thought it would be more user-friendly to output the symbolic name of the
> limit when setrlimit(2) or getrlimit(2) fails. Patch attached.

Thanks, committed.

 - todd