get_ref_dir(): take the containing directory as argument

diff --git a/builtin/diff.c b/builtin/diff.c
index 424c815f9bc2ca8f87eb4694d1375b949b635170..9069dc41be33a362ff04d52c00b4830eed272826 100644 (file)
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -327,7 +327,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
                                add_head_to_pending(&rev);
                                if (!rev.pending.nr) {
                                        struct tree *tree;
-                                       tree = lookup_tree((const unsigned char*)EMPTY_TREE_SHA1_BIN);
+                                       tree = lookup_tree(EMPTY_TREE_SHA1_BIN);
                                        add_pending_object(&rev, &tree->object, "HEAD");
                                }
                                break;