6659 nvlist_free(NULL) is a no-op

*** 3239,3249 ****
                  case 'R':
                          flags.import = B_TRUE;
                          if (add_prop_list(
                              zpool_prop_to_name(ZPOOL_PROP_ALTROOT), optarg,
                              &props, B_TRUE) != 0) {
-                                 if (props)
                                          nvlist_free(props);
                                  usage(B_FALSE);
                          }
                          break;
                  case 'n':
--- 3239,3248 ----
*** 3253,3263 ****
                          if ((propval = strchr(optarg, '=')) != NULL) {
                                  *propval = '\0';
                                  propval++;
                                  if (add_prop_list(optarg, propval,
                                      &props, B_TRUE) != 0) {
-                                         if (props)
                                                  nvlist_free(props);
                                          usage(B_FALSE);
                                  }
                          } else {
                                  mntopts = optarg;
--- 3252,3261 ----