Merge branch 'jk/diff-graph-submodule-summary'

Make "git diff --graph" work better with submodule log output.

* jk/diff-graph-submodule-summary:
  submodule: print graph output next to submodule log

diff.c

@@ -2255,6 +2255,7 @@ static void builtin_diff(const char *name_a,
 		const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
 		const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
 		show_submodule_summary(o->file, one ? one->path : two->path,
+				line_prefix,
 				one->sha1, two->sha1, two->dirty_submodule,
 				meta, del, add, reset);
 		return;