Bug#515705: libdvdnav4: dumps warnings to stdout

[Elena ``of Valhalla'']

I've checked for this and it is still happening (but at first I didn't
understand what the bug meant).

To reproduce, don't use Media --> Open Directory... to open a DVD Rip 
directory (ad I understood at first), but the playlist mode (View ->
Playlist if it is not already visible) and click on e.g. My Music
or any other non-DVD directory on the left bar.

This also applies to libdvdread, which gives a similar error:

    libdvdnav: Using dvdnav version 5.0.1
    libdvdread: Couldn't find device name.
    libdvdread:DVDOpenFilePath:findDVDFile /VIDEO_TS/VIDEO_TS.IFO failed
    libdvdread:DVDOpenFilePath:findDVDFile /VIDEO_TS/VIDEO_TS.BUP failed
    libdvdread: Can't open file VIDEO_TS.IFO.
    libdvdnav: vm: failed to read VIDEO_TS.IFO

-- 
Elena ``of Valhalla''