Fixes the following sparse warnings:

 drivers/char/drm/via_dmablit.c:111:35: warning: Using plain integer as NULL pointer
 drivers/char/drm/via_dmablit.c:584:23: warning: Using plain integer as NULL pointer
Signed-off-by: NLuiz Capitulino <lcapitulino@mandriva.com.br>
Signed-off-by: NDave Airlie <airlied@linux.ie>

This updates the DRM via driver to the latest CVS version, which contains
support for DMA blitting.

It also contains some whitespace and other minor fixes

From: Thomas Hellstrom <unichrome@shipmail.org>
Signed-off-by: NDave Airlie <airlied@linux.ie>