What's the best way to fix warnings from unused result

[Hal Murray]

> Does a simple void cast work?  E.g.:
>  	(void) strerror_r(...)

I haven't found the magic using that approach.

../../ntpd/nts.c:214:16: warning: ignoring return value of ‘strerror_r’, 
declared with attribute warn_unused_result [-Wunused-result]
         (void) strerror_r(errno, errbuf, sizeof(errbuf));
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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