6659 nvlist_free(NULL) is a no-op

*** 2008,2018 ****
                      nvlist_lookup_uint64(zplprops, zfs_prop_to_name(prop),
                      val) != 0) {
                          zcmd_free_nvlists(&zc);
                          return (-1);
                  }
-                 if (zplprops)
                          nvlist_free(zplprops);
                  zcmd_free_nvlists(&zc);
                  break;
  
          case ZFS_PROP_INCONSISTENT:
--- 2008,2017 ----
*** 4240,4250 ****
                  break;
          default:
                  return (-1);
          }
          error = ioctl(hdl->libzfs_fd, ZFS_IOC_SMB_ACL, &zc);
-         if (nvlist)
                  nvlist_free(nvlist);
          return (error);
  }
  
  int
--- 4239,4248 ----