drm/i915: Stop clearing i915_ggtt_view

As we now use a compact memcmp in i915_vma_compare(), we can forgo
clearing the entire view and only set the precise parameters used in
this view.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170114002827.31315-4-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_gem.c

@@ -1759,7 +1759,6 @@ compute_partial_view(struct drm_i915_gem_object *obj,
 	if (i915_gem_object_is_tiled(obj))
 		chunk = roundup(chunk, tile_row_pages(obj));
 
-	memset(&view, 0, sizeof(view));
 	view.type = I915_GGTT_VIEW_PARTIAL;
 	view.params.partial.offset = rounddown(page_offset, chunk);
 	view.params.partial.size =