submodule--helper: remove --prefix from "absorbgitdirs"

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

When it was added in f6f8586140 (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>
Signed-off-by: Taylor Blau <me@ttaylorr.com>

builtin/submodule--helper.c

@@ -2831,9 +2831,6 @@ 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[] = {

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