windowscodecs: add a WARN message when CreateDecoderFromStream fails

[Vincent Povirk]

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.winehq.org/pipermail/wine-patches/attachments/20090814/bf1bce14/attachment.htm>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: 0001-windowscodecs-add-a-WARN-message-when-CreateDecoder.txt
URL: <http://www.winehq.org/pipermail/wine-patches/attachments/20090814/bf1bce14/attachment.txt>