6659 nvlist_free(NULL) is a no-op

@@ -2751,11 +2751,10 @@
                     stream_nv, stream_avl, NULL);
         }
 
 out:
         fsavl_destroy(stream_avl);
-        if (stream_nv)
                 nvlist_free(stream_nv);
         if (softerr)
                 error = -2;
         if (anyerr)
                 error = -1;