Adapt the patch to more recent FFmpeg habits

- Indentation
- Use av_log instead of fprintf
- Removed strdup of the device name. It was unused
- Cleaned things a bit
(patch by Edouard Gomez)


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@7303 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b