fixup! TO-DROP: bogus left-over from 'sparse-checkout: make 'clean' clear more files'

This is no longer needed.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

unpack-trees.c

@@ -2178,7 +2178,7 @@ enum update_sparsity_result update_sparsity(struct unpack_trees_options *o,
 	index_state_init(&o->internal.result, o->src_index->repo);
 
 	/* Sanity checks */
-	if (o->index_only || o->skip_sparse_checkout)
+	if (!o->update || o->index_only || o->skip_sparse_checkout)
 		BUG("update_sparsity() is for reflecting sparsity patterns in working directory");
 	if (o->src_index != o->dst_index || o->fn)
 		BUG("update_sparsity() called wrong");