Improve logging in a test

testsuite/expect/test12.1

@@ -77,7 +77,7 @@ if {$not_support != 0} {
 	exit 0
 }
 if {$matches != 3} {
-	send_user "\nFAILURE: sacct --help failed ($matches)\n"
+	send_user "\nFAILURE: sacct --help failed ($matches != 3)\n"
 	set exit_code 1
 }