t2105 (gitfile): add missing &&

Make sure early failures are not masked by later successes.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Acked-by: Brad King <brad.king@kitware.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t2105-update-index-gitfile.sh

@@ -13,7 +13,7 @@ test_expect_success 'submodule with absolute .git file' '
 	(cd sub1 &&
 	 git init &&
 	 REAL="$(pwd)/.real" &&
-	 mv .git "$REAL"
+	 mv .git "$REAL" &&
 	 echo "gitdir: $REAL" >.git &&
 	 test_commit first)
 '