update-ref --stdin: simplify error messages for missing oldvalues

Instead of, for example,

    fatal: update refs/heads/master missing [<oldvalue>] NUL

emit

    fatal: update refs/heads/master missing <oldvalue>

Update the tests accordingly.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/update-ref.c

@@ -176,7 +176,7 @@ static const char *parse_cmd_update(struct strbuf *input, const char *next)
 		if (*next != line_termination)
 			die("update %s has extra input: %s", update->ref_name, next);
 	} else if (!line_termination)
-		die("update %s missing [<oldvalue>] NUL", update->ref_name);
+		die("update %s missing <oldvalue>", update->ref_name);
 
 	return next;
 }
@@ -222,7 +222,7 @@ static const char *parse_cmd_delete(struct strbuf *input, const char *next)
 		if (update->have_old && is_null_sha1(update->old_sha1))
 			die("delete %s given zero <oldvalue>", update->ref_name);
 	} else if (!line_termination)
-		die("delete %s missing [<oldvalue>] NUL", update->ref_name);
+		die("delete %s missing <oldvalue>", update->ref_name);
 
 	if (*next != line_termination)
 		die("delete %s has extra input: %s", update->ref_name, next);
@@ -245,7 +245,7 @@ static const char *parse_cmd_verify(struct strbuf *input, const char *next)
 		update_store_old_sha1("verify", update, value.buf);
 		hashcpy(update->new_sha1, update->old_sha1);
 	} else if (!line_termination)
-		die("verify %s missing [<oldvalue>] NUL", update->ref_name);
+		die("verify %s missing <oldvalue>", update->ref_name);
 
 	if (*next != line_termination)
 		die("verify %s has extra input: %s", update->ref_name, next);

t/t1400-update-ref.sh

@@ -739,7 +739,7 @@ test_expect_success 'stdin -z fails update with no new value' '
 test_expect_success 'stdin -z fails update with no old value' '
 	printf $F "update $a" "$m" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: update $a missing \\[<oldvalue>\\] NUL" err
+	grep "fatal: update $a missing <oldvalue>" err
 '
 
 test_expect_success 'stdin -z fails update with too many arguments' '
@@ -763,7 +763,7 @@ test_expect_success 'stdin -z fails delete with bad ref name' '
 test_expect_success 'stdin -z fails delete with no old value' '
 	printf $F "delete $a" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: delete $a missing \\[<oldvalue>\\] NUL" err
+	grep "fatal: delete $a missing <oldvalue>" err
 '
 
 test_expect_success 'stdin -z fails delete with too many arguments' '
@@ -781,7 +781,7 @@ test_expect_success 'stdin -z fails verify with too many arguments' '
 test_expect_success 'stdin -z fails verify with no old value' '
 	printf $F "verify $a" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: verify $a missing \\[<oldvalue>\\] NUL" err
+	grep "fatal: verify $a missing <oldvalue>" err
 '
 
 test_expect_success 'stdin -z fails option with unknown name' '