tree-diff: don't access hash of NULL object_id pointer

diff --git a/submodule.h b/submodule.h
index 266d81f1c4e46b43e21e506a40762cec5bbd9de6..8fb0f25498d58344adb86fee53770bb11cf36cbc 100644 (file)
--- a/submodule.h
+++ b/submodule.h
@@ -88,10 +88,10 @@ extern int submodule_uses_gitfile(const char *path);
 #define SUBMODULE_REMOVAL_IGNORE_UNTRACKED (1<<1)
 #define SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED (1<<2)
 extern int bad_to_remove_submodule(const char *path, unsigned flags);
-extern int merge_submodule(unsigned char result[20], const char *path,
-                          const unsigned char base[20],
-                          const unsigned char a[20],
-                          const unsigned char b[20], int search);
+extern int merge_submodule(struct object_id *result, const char *path,
+                          const struct object_id *base,
+                          const struct object_id *a,
+                          const struct object_id *b, int search);
 extern int find_unpushed_submodules(struct oid_array *commits,
                                    const char *remotes_name,
                                    struct string_list *needs_pushing);