Address Turbo C warnings
Address Turbo C warnings

Return from main() using return instead of exit().

Signed-off-by: Claudio Matsuoka <ef7f691d9947ca9adbfeb1538a53a661ec9f041b@gmail.com>

cmatsuoka/figlet,Distrotech/figlet,Distrotech/figlet,cmatsuoka/figlet