git-submodule: replace duplicated code with a module_list function

diff --git a/builtin-diff-index.c b/builtin-diff-index.c
index 2f44ebfcdd86cde2347258dbeb1e5c4b9cab0622..17d851b29ee5de33e01745eabcd5cd735c30b352 100644 (file)
--- a/builtin-diff-index.c
+++ b/builtin-diff-index.c
@@ -5,7 +5,7 @@
 #include "builtin.h"
 
 static const char diff_cache_usage[] =
-"git-diff-index [-m] [--cached] "
+"git diff-index [-m] [--cached] "
 "[<common diff options>] <tree-ish> [<path>...]"
 COMMON_DIFF_OPTIONS_HELP;