t6039: fix broken && chain

Add missing &&, detected by the --chain-lint option

Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t6039-merge-ignorecase.sh

@@ -15,7 +15,7 @@ test_expect_success 'merge with case-changing rename' '
 	>TestCase &&
 	git add TestCase &&
 	git commit -m "add TestCase" &&
-	git tag baseline
+	git tag baseline &&
 	git checkout -b with-camel &&
 	>foo &&
 	git add foo &&