handle multibyte characters in name

Many "git submodule" operations do not work on a submodule at a path whose
name is not in ASCII.

This is because "git ls-files" is used to find which paths are bound to
submodules to the current working tree, and the output is C-quoted by default
for non ASCII pathnames.

Tell "git ls-files" to not C-quote its output, which is easier than unwrapping
C-quote ourselves.

Signed-off-by: Fredrik Gustafsson <iveqy@iveqy.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/git-submodule.sh b/git-submodule.sh
index 79bfaac..48bdf84 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -113,7 +113,7 @@
 module_list()
 {
 	(
-		git ls-files --error-unmatch --stage -- "$@" ||
+		git ls-files -z --error-unmatch --stage -- "$@" ||
 		echo "unmatched pathspec exists"
 	) |
 	perl -e '
@@ -121,6 +121,7 @@
 	my ($null_sha1) = ("0" x 40);
 	my @out = ();
 	my $unmatched = 0;
+	$/ = "\0";
 	while (<STDIN>) {
 		if (/^unmatched pathspec/) {
 			$unmatched = 1;