t7403: add missing && chaining

Signed-off-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7403-submodule-sync.sh

@@ -174,7 +174,7 @@ test_expect_success '"git submodule sync" handles origin URL of the form foo/bar
 			cd submodule &&
 			#actual foo/submodule
 			test "$(git config remote.origin.url)" = "../foo/submodule"
-		)
+		) &&
 		(
 			cd submodule/sub-submodule &&
 			test "$(git config remote.origin.url)" != "../../foo/submodule"
@@ -191,7 +191,7 @@ test_expect_success '"git submodule sync --recursive" propagates changes in orig
 			cd submodule &&
 			#actual foo/submodule
 			test "$(git config remote.origin.url)" = "../foo/submodule"
-		)
+		) &&
 		(
 			cd submodule/sub-submodule &&
 			test "$(git config remote.origin.url)" = "../../foo/submodule"