t5530: check protocol response for "not our ref"

Back in 9f9aa76130 (upload-pack: Improve error message when bad ref
requested, 2010-07-31), we added a test to make sure that we die with a
sensible message when the client asks for an object we don't have.

Much later, in bdb31eada7 (upload-pack: report "not our ref" to client,
2017-02-23), we started reporting that information via an "ERR" line in
the protocol. Let's check that part, as well.

While we're touching this test, let's drop the "-q" on the grep calls.
Our usual test style just relies on --verbose to control output.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5530-upload-pack-error.sh

@@ -62,8 +62,9 @@ test_expect_success 'upload-pack error message when bad ref requested' '
 	printf "0045want %s multi_ack_detailed\n00000009done\n0000" \
 		"deadbeefdeadbeefdeadbeefdeadbeefdeadbeef" >input &&
 	test_must_fail git upload-pack . <input >output 2>output.err &&
-	grep -q "not our ref" output.err &&
-	! grep -q multi_ack_detailed output.err
+	grep "not our ref" output.err &&
+	grep "ERR" output &&
+	! grep multi_ack_detailed output.err
 '
 
 test_expect_success 'upload-pack fails due to error in pack-objects enumeration' '