[PATCH] t7406: fix breakage on OSX

[Stefan Beller <sbeller@google.com>]

On OSX `wc` prefixes the output of numbers with whitespace, such that
the `commit_count` would be "SP <NUMBER>". When using that in

    git submodule update --init --depth=$commit_count

the depth would be empty and the number is interpreted as the pathspec.
Fix this by not using `wc` and rather instruct rev-list to count.

Another way to fix this is to remove the `=` sign after the `--depth`
argument as then we are allowed to have more than just one whitespace
between `--depth` and the actual number. Prefer the solution of rev-list
counting as that is expected to be slightly faster and more self-sustained
within Git.

Reported-by: Lars Schneider <larsxschneider@gmail.com>
Helped-by: Junio C Hamano <gitster@pobox.com>,
Signed-off-by: Stefan Beller <sbeller@google.com>
---

  origin/sb/submodule-update-dot-branch

 t/t7406-submodule-update.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t7406-submodule-update.sh b/t/t7406-submodule-update.sh
index d7983cf..64f322c 100755
--- a/t/t7406-submodule-update.sh
+++ b/t/t7406-submodule-update.sh
@@ -877,7 +877,7 @@ test_expect_success 'submodule update clone shallow submodule' '
 	test_when_finished "rm -rf super3" &&
 	first=$(git -C cloned submodule status submodule |cut -c2-41) &&
 	second=$(git -C submodule rev-parse HEAD) &&
-	commit_count=$(git -C submodule rev-list $first^..$second | wc -l) &&
+	commit_count=$(git -C submodule rev-list --count $first^..$second) &&
 	git clone cloned super3 &&
 	pwd=$(pwd) &&
 	(
-- 
2.9.2.665.gdb8bb2f