refs/ref-cache.[ch]: remove "incomplete" from create_dir_entry()

Remove the now-unused "incomplete" parameter from create_dir_entry(),
all its callers specify it as "1", so let's drop the "incomplete=0"
case. The last caller to use it was search_for_subdir(), but that code
was removed in the preceding commit.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 74c0385..8fa3281 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -227,7 +227,7 @@ static void add_per_worktree_entries_to_dir(struct ref_dir *dir, const char *dir
 		pos = search_ref_dir(dir, prefix, prefix_len);
 		if (pos >= 0)
 			continue;
-		child_entry = create_dir_entry(dir->cache, prefix, prefix_len, 1);
+		child_entry = create_dir_entry(dir->cache, prefix, prefix_len);
 		add_entry_to_dir(dir, child_entry);
 	}
 }
@@ -278,7 +278,7 @@ static void loose_fill_ref_dir(struct ref_store *ref_store,
 			strbuf_addch(&refname, '/');
 			add_entry_to_dir(dir,
 					 create_dir_entry(dir->cache, refname.buf,
-							  refname.len, 1));
+							  refname.len));
 		} else {
 			if (!refs_resolve_ref_unsafe(&refs->base,
 						     refname.buf,
@@ -336,7 +336,7 @@ static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs)
 		 * lazily):
 		 */
 		add_entry_to_dir(get_ref_dir(refs->loose->root),
-				 create_dir_entry(refs->loose, "refs/", 5, 1));
+				 create_dir_entry(refs->loose, "refs/", 5));
 	}
 	return refs->loose;
 }