Simple suggestion for avoiding infinite redirects

This improvements address two things:
* Some minor speed improvement
* Avoid redirecting to where we just come from.

I forked the file eps-301-redirects.php to eps-301-redirects-reh.php, and this is the patch:

*** eps-301-redirects.php	2021-01-30 10:50:02.000000000 +0100
--- eps-301-redirects-reh.php	2021-02-01 16:58:28.363247152 +0100
***************
*** 119,128 ****
        $query_string = (isset($query_string[1])) ? $query_string[1] : false;
  
  
        foreach ($redirects as $redirect) {
          $from = urldecode(html_entity_decode($redirect->url_from));
  
!         if ($redirect->status != 'inactive' && rtrim(trim($url_request), '/')  === self::format_from_url(trim($from))) {
  
            // Match, this needs to be redirected
            // increment this hit counter.
--- 119,130 ----
        $query_string = (isset($query_string[1])) ? $query_string[1] : false;
  
  
+       $url_request_canonical = rtrim(trim($url_request), '/');
+ 
        foreach ($redirects as $redirect) {
          $from = urldecode(html_entity_decode($redirect->url_from));
  
!         if ($redirect->status != 'inactive' && $url_request_canonical  === self::format_from_url(trim($from))) {
  
            // Match, this needs to be redirected
            // increment this hit counter.
***************
*** 138,146 ****
  
            $to = ($redirect->type == "url" && !is_numeric($redirect->url_to)) ? urldecode(html_entity_decode($redirect->url_to)) : get_permalink($redirect->url_to);
            $to = ($query_string) ? $to . "?" . $query_string : $to;
! 
!           header('Location: ' . $to, true, (int)$redirect->status);
!           exit();
          }
        }
      }
--- 140,157 ----
  
            $to = ($redirect->type == "url" && !is_numeric($redirect->url_to)) ? urldecode(html_entity_decode($redirect->url_to)) : get_permalink($redirect->url_to);
            $to = ($query_string) ? $to . "?" . $query_string : $to;
!           
!           $do_redirect = true;
!           $to_arr = parse_url($to);
!           
!           if (array_key_exists('path', $to_arr)) {
!             $do_redirect = !( (rtrim($to_arr['path'], '/') === $url_request_canonical) );
!           }
!           
!           if ($do_redirect) {
!             header('Location: ' . $to, true, (int)$redirect->status);
!             exit();
!           }
          }
        }
      }