Merge branch 'sb/submodule-move-head-error-msg'

"git checkout --recurse-submodules another-branch" did not report
in which submodule it failed to update the working tree, which
resulted in an unhelpful error message.

* sb/submodule-move-head-error-msg:
  submodule.c: report the submodule that an error occurs in

Author: gitster

submodule.c

@@ -1682,7 +1682,7 @@ int submodule_move_head(const char *path,
 	argv_array_push(&cp.args, new_head ? new_head : empty_tree_oid_hex());
 
 	if (run_command(&cp)) {
-		ret = -1;
+		ret = error(_("Submodule '%s' could not be updated."), path);
 		goto out;
 	}
 

t/lib-submodule-update.sh

@@ -782,7 +782,8 @@ test_submodule_recursing_with_args_common() {
 		(
 			cd submodule_update &&
 			git branch -t invalid_sub1 origin/invalid_sub1 &&
-			test_must_fail $command invalid_sub1 &&
+			test_must_fail $command invalid_sub1 2>err &&
+			test_i18ngrep sub1 err &&
 			test_superproject_content origin/add_sub1 &&
 			test_submodule_content sub1 origin/add_sub1
 		)