replace static_cast by the null ptr constructor
replace static_cast by the null ptr constructor

svn path=/trunk/KDE/kdelibs/kate/; revision=906814

hlamer/kate,hlamer/kate,sandsmark/kate,hlamer/kate,sandsmark/kate,sandsmark/kate,hlamer/kate,hlamer/kate,DickJ/kate,sandsmark/kate,hlamer/kate,DickJ/kate,jfmcarreira/kate,cmacq2/kate,DickJ/kate,hlamer/kate,hlamer/kate,DickJ/kate,cmacq2/kate,jfmcarreira/kate,cmacq2/kate,jfmcarreira/kate,hlamer/kate,hlamer/kate