git p4 test: cleanup_git should make a new $git

For convenience, leave one in place at the end of each
test so that it is not necessary to build a new one.  This
makes it consistent with $cli.

Signed-off-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9800-git-p4-basic.sh

@@ -270,6 +270,7 @@ test_expect_success 'wildcard files submit back to p4, delete' '
 '
 
 test_expect_success 'clone bare' '
+	rm -rf "$git" &&
 	git p4 clone --dest="$git" --bare //depot &&
 	test_when_finished cleanup_git &&
 	(