For whatever reason neither the new seek slider or the volume button actually
show up for me when I tested it (although clicking around where the seek slider
should be does work). Something related to this causes the VolumeSlider's
createWidget() method to never be run, which causes this line to crash after
dereferencing the null pointer.

Until I figure it out better (or wheels does ;) just make the crash go away.

svn path=/trunk/KDE/kdemultimedia/juk/; revision=1231079