signal.c: Change printsignal to properly handle xlat styles

[Dmitry V. Levin]

On Fri, Dec 21, 2018 at 08:05:53PM -0800, shankarapailoor wrote:
> >btw, have you tried to invoke k_sigaction with an invalid signal number,
> e.g. -1?  Does the output look good in verbose mode?
> 
> Ah good point. I didn't consider that. With my change verbose mode
> prints -1 /* -1 */ which is wrong. Here is a patch which addresses
> that along with your above comments.

Would the output still be OK in verbose mode in case of other
invalid signal numbers, e.g. 256?


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