illumos gate

Build errors with NULL pointer:

    ../whodo.c: In function 'clnarglist':
    ../whodo.c:828:23: error: comparison between pointer and integer [-Werror]
      for (c = arglist; *c == NULL; c++) {
                           ^~
    ../whodo.c:831:14: error: assignment makes integer from pointer without a cast [-Werror=int-conversion]
         *arglist = NULL;
                  ^
    cc1: all warnings being treated as errors