Merge branch 'sb/cd-then-git-can-be-written-as-git-c'

Test clean-up.

* sb/cd-then-git-can-be-written-as-git-c:
  lib-submodule-update.sh: reduce use of subshell by using "git -C"

t/lib-submodule-update.sh

@@ -69,10 +69,7 @@ create_lib_submodule_repo () {
 
 		git checkout -b "replace_sub1_with_directory" "add_sub1" &&
 		git submodule update &&
-		(
-			cd sub1 &&
-			git checkout modifications
-		) &&
+		git -C sub1 checkout modifications &&
 		git rm --cached sub1 &&
 		rm sub1/.git* &&
 		git config -f .gitmodules --remove-section "submodule.sub1" &&