drm: Prefer kcalloc() over kzalloc() with multiply
drm: Prefer kcalloc() over kzalloc() with multiply

Fixes a couple of checkpatch warnings regarding the use of kzalloc()
with a multiplication. kcalloc() is the preferred API.

Signed-off-by: Thierry Reding <3055038c414aef68bf32c33b8118623e7554e0f2@nvidia.com>
Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@ffwll.ch>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs