gdiplus: Reset the lock count when unlocking a bitmap in write mode.

[Vincent Povirk]

For bug 16670.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.winehq.org/pipermail/wine-patches/attachments/20100101/c0d27c92/attachment-0001.htm>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: 0001-gdiplus-Reset-the-lock-count-when-unlocking-a-bitmap-i.txt
URL: <http://www.winehq.org/pipermail/wine-patches/attachments/20100101/c0d27c92/attachment-0001.txt>