linux-phytec-ti

drm/i915: Clean up aliasing ppgtt correctly on error paths

While at it inline the free functions - they don't actually free the
ppgtt, just clean up the allocations done for it.

Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>