WL#4198 mtr.pl v2

 - fix typo, use "$old_log_error" as name when loading from .err-old file

mysql-test/include/check-warnings.test

@@ -42,7 +42,7 @@ if ($mysql_errno)
   let $old_log_error = $log_error-old;
   chmod 0644 $old_log_error;
   eval load data infile '$old_log_error' into table error_log (line)
-    set file_name='$log_error';
+    set file_name='$old_log_error';
 }
 
 # Call check_warnings to filter out any warning in