Mark usage() as noreturn
Quiets clang warning:
showfont.c:345:1: warning: function 'usage' could be declared with attribute 'noreturn' [-Wmissing-noreturn]
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Quiets clang warning:
showfont.c:345:1: warning: function 'usage' could be declared with attribute 'noreturn' [-Wmissing-noreturn]