drm/radeon: fix vm buffer size estimation
drm/radeon: fix vm buffer size estimation

Only relevant if we got VM_BLOCK_SIZE>9, but better save than sorry.

Signed-off-by: Christian König <c7ea837d7a46effe4232b086213468b8b31643bf@amd.com>

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