Is t5601 flaky for anybody else?

[Junio C Hamano <gitster@pobox.com>]

I seem to be seeing sporadic errors with this test, and today I got
annoyed enough to do

	cd t && while sh t5601-clone.sh -i -v; do :; done

I saw an error from "cp" saying "plink.exe - text file busy" or
something like that at around test #45; here is an workaround that
seems to work (the above loop is spinning without problem for
several minutes now).

 t/t5601-clone.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index 9c56f771b6..50e40abb11 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -308,6 +308,7 @@ test_expect_success 'clone checking out a tag' '
 
 setup_ssh_wrapper () {
 	test_expect_success 'setup ssh wrapper' '
+		rm -f "$TRASH_DIRECTORY/ssh-wrapper$X" &&
 		cp "$GIT_BUILD_DIR/t/helper/test-fake-ssh$X" \
 			"$TRASH_DIRECTORY/ssh-wrapper$X" &&
 		GIT_SSH="$TRASH_DIRECTORY/ssh-wrapper$X" &&
@@ -318,6 +319,7 @@ setup_ssh_wrapper () {
 }
 
 copy_ssh_wrapper_as () {
+	rm -f "${1%$X}$X" &&
 	cp "$TRASH_DIRECTORY/ssh-wrapper$X" "${1%$X}$X" &&
 	GIT_SSH="${1%$X}$X" &&
 	export GIT_SSH