submodule--helper: remove unused "name" helper

The "name" helper has not been used since e83e3333b5 (submodule: port
submodule subcommand 'summary' from shell to C, 2020-08-13).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Reviewed-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/submodule--helper.c

@@ -771,24 +771,6 @@ static int module_status(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
-static int module_name(int argc, const char **argv, const char *prefix)
-{
-	const struct submodule *sub;
-
-	if (argc != 2)
-		usage(_("git submodule--helper name <path>"));
-
-	sub = submodule_from_path(the_repository, null_oid(), argv[1]);
-
-	if (!sub)
-		die(_("no submodule mapping found in .gitmodules for path '%s'"),
-		    argv[1]);
-
-	printf("%s\n", sub->name);
-
-	return 0;
-}
-
 struct module_cb {
 	unsigned int mod_src;
 	unsigned int mod_dst;
@@ -3359,7 +3341,6 @@ struct cmd_struct {
 
 static struct cmd_struct commands[] = {
 	{"list", module_list, 0},
-	{"name", module_name, 0},
 	{"clone", module_clone, SUPPORT_SUPER_PREFIX},
 	{"add", module_add, 0},
 	{"update", module_update, SUPPORT_SUPER_PREFIX},