fix wrong commit, use ckintval to check int/bignum error and returns the value
fix wrong commit, use ckintval to check int/bignum error and returns the value

bmagyar/EusLisp,bmagyar/EusLisp,wkentaro/EusLisp,aginika/EusLisp,wkentaro/EusLisp,wkentaro/EusLisp,aginika/EusLisp,aginika/EusLisp,aginika/EusLisp,bmagyar/EusLisp,bmagyar/EusLisp,wkentaro/EusLisp