tests: fix diff order arguments in test_cmp

Fix the argument order for test_cmp. When given the expected
result first the diff shows the actual output with '+' and the
expectation with '-', which is the convention for our tests.

Signed-off-by: Stefan Beller <sbeller@google.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t7005-editor.sh b/t/t7005-editor.sh
index 1b530b5..29e5043 100755
--- a/t/t7005-editor.sh
+++ b/t/t7005-editor.sh
@@ -38,7 +38,7 @@
 	test_commit "$msg" &&
 	echo "$msg" >expect &&
 	git show -s --format=%s > actual &&
-	test_cmp actual expect
+	test_cmp expect actual
 
 '
 
@@ -85,7 +85,7 @@
 		git --exec-path=. commit --amend &&
 		git show -s --pretty=oneline |
 		sed -e "s/^[0-9a-f]* //" >actual &&
-		test_cmp actual expect
+		test_cmp expect actual
 	'
 done
 
@@ -107,7 +107,7 @@
 		git --exec-path=. commit --amend &&
 		git show -s --pretty=oneline |
 		sed -e "s/^[0-9a-f]* //" >actual &&
-		test_cmp actual expect
+		test_cmp expect actual
 	'
 done