Preventing users from voting multiple times on a single bug

Hi,
This is my attempt at a patch for a bug related to users being able to
vote multiple times on the same bug (full report is at
https://bugs.php.net/bug.php?id=51535). While this isn't a huge change I
wanted to get confirmation on a few things before I went ahead so that I
didn't break anything too badly.

1. Is this the correct list for changes related to bugs.php.net itself? If
   not, what is the correct mailing list for this change?

2. I see php-src has a defined coding standard however I wasn't able
   to see one for bugs.php.net so I have just gone with the standards that
   were already present near my changes. If there is a defined
   standards guideline which I have missed, feel free to direct me that
   way and I will check for any violations within my changes before this
   is merged.

3. Hannes was nice enough to give me some direction around getting my
   changes reviewed however with code changes is the preferred option to
   get review and merge it yourself? Or is there a release cycle? Or how
   does that aspect work?

I've attached the patch and opened a pull request via GitHub
(https://github.com/php/web-bugs/pull/13) for anyone that would like to
review this one for me.

Thanks again,
Jacob.