Fix the testing for variadic routine
Fix the testing for variadic routine

A variadic function can have only fixed arguments filled:

    printf("hello, world\n");

draegtun/ren-c,codebybrett/ren-c,hostilefork/rebol,kealist/ren-c,giuliolunati/ren-c,kealist/ren-c,codebybrett/ren-c,rgchris/ren-c,giuliolunati/ren-c,kealist/ren-c,hostilefork/rebol,hostilefork/rebol,giuliolunati/ren-c,draegtun/ren-c,giuliolunati/ren-c,draegtun/ren-c,codebybrett/ren-c,giuliolunati/ren-c,kealist/ren-c,draegtun/ren-c,codebybrett/ren-c,draegtun/ren-c,kealist/ren-c,rgchris/ren-c,draegtun/ren-c,hostilefork/rebol,codebybrett/ren-c,rgchris/ren-c,hostilefork/rebol,rgchris/ren-c,rgchris/ren-c,codebybrett/ren-c,hostilefork/rebol,kealist/ren-c