Fix defects from the groups merge.

[frank-trampe]

This addresses some issues from #1760 that Coverity reported.

[frank-trampe]

@tshinnic, take a look.

[adrientetar]

lgtm

[tshinnic]

Looks good to me too. Whoa, wait. What about lines 855 and 861? Same pattern as 838 and 844.

if (kc->firsts_names[tmppos] != NULL) { free(kc->firsts_names); kc->firsts_names = NULL; }


if (kc->seconds_names[tmppos] != NULL) { free(kc->seconds_names); kc->seconds_names = NULL; }

[frank-trampe]

Thanks for pointing that out. I have fixed that as well.

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