Let me bold some things for you ;)

void
QAErrorMessage(err_code, ret_error, bufflen)
        int     err_code
        SV*     ret_error
        int     bufflen
    OUTPUT:
        ret_error

void and OUTPUT do not mix (void means no output). You should try something like

void
QAErrorMessage(error_code)
    CASE:
        int     err_code
    PREINIT:
        int     bufflen = 256;
        char    ret_error[bufflen];
    PPCODE:
    {
         QAErrorMessage(err_code, ret_error, bufflen);
         XPUSHs(sv_2mortal( newSVpvn(ret_error,bufflen) ));
    }
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