6659 nvlist_free(NULL) is a no-op

@@ -2008,11 +2008,10 @@
                     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:

@@ -4240,11 +4239,10 @@
                 break;
         default:
                 return (-1);
         }
         error = ioctl(hdl->libzfs_fd, ZFS_IOC_SMB_ACL, &zc);
-        if (nvlist)
                 nvlist_free(nvlist);
         return (error);
 }
 
 int