OS-1574 libzdoor checks for NULL that cannot be

*** 166,177 ****
          if (zoneid < 0) {
                  zdoor_debug("zdoor_fattach: zoneid < 0");
                  return (ZDOOR_ARGS_ERROR);
          }
  
!         if (path == NULL) {
!                 zdoor_debug("zdoor_fattach: NULL PATH");
                  return (ZDOOR_ARGS_ERROR);
          }
  
          if ((tmpl_fd = init_template()) < 0) {
                  zdoor_warn("zdoor_fattach: init contract for %d:%s failed",
--- 166,177 ----
          if (zoneid < 0) {
                  zdoor_debug("zdoor_fattach: zoneid < 0");
                  return (ZDOOR_ARGS_ERROR);
          }
  
!         if (service == NULL) {
!                 zdoor_debug("zdoor_fattach: NULL service");
                  return (ZDOOR_ARGS_ERROR);
          }
  
          if ((tmpl_fd = init_template()) < 0) {
                  zdoor_warn("zdoor_fattach: init contract for %d:%s failed",