motionblur: remove obsolete and useless statement.
motionblur: remove obsolete and useless statement.

This slipped through when doing the initial implementation and stayed
unnoticed since. Sorry about that.

Squareys/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples