[PATCH 6/8] submodule--helper: remove --prefix from "absorbgitdirs"

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Let's pass the "-C <prefix>" option instead to "absorbgitdirs" from
its only caller.

When it was added in f6f85861400 (submodule: add absorb-git-dir
function, 2016-12-12) there were other "submodule--helper" subcommands
that were invoked with "-C <prefix>", so we could have done this all
along.

Suggested-by: Glen Choo <chooglen@google.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 builtin/submodule--helper.c | 3 ---
 git-submodule.sh            | 2 +-
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 8b4af8430dc..6bbefd34374 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -2830,9 +2830,6 @@ static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
 	struct pathspec pathspec = { 0 };
 	struct module_list list = MODULE_LIST_INIT;
 	struct option embed_gitdir_options[] = {
-		OPT_STRING(0, "prefix", &prefix,
-			   N_("path"),
-			   N_("path into the working tree")),
 		OPT_END()
 	};
 	const char *const git_submodule_helper_usage[] = {
diff --git a/git-submodule.sh b/git-submodule.sh
index 5e5d21c010f..d359f171379 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -557,7 +557,7 @@ cmd_sync()
 
 cmd_absorbgitdirs()
 {
-	git submodule--helper absorbgitdirs --prefix "$wt_prefix" "$@"
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper absorbgitdirs "$@"
 }
 
 # This loop parses the command line arguments to find the
-- 
2.38.0.1280.g8136eb6fab2