Improve handling of realloc()
Fixes cppcheck warning:
[fslsfonts.c:268]: (error) Common realloc mistake: 'font_list' nulled but not freed upon failureUses reallocarray() if available from either libc or libbsd.
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Fixes cppcheck warning:
[fslsfonts.c:268]: (error) Common realloc mistake: 'font_list' nulled but not freed upon failureUses reallocarray() if available from either libc or libbsd.