drm/i915: Remove unneeded drm_device pointer from intel_ring_init_seqno()

We only use drm_i915_private within the function, so delete the unneeded
drm_device local.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460010558-10705-3-git-send-email-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -2550,13 +2550,12 @@ int intel_ring_cacheline_align(struct drm_i915_gem_request *req)
 
 void intel_ring_init_seqno(struct intel_engine_cs *engine, u32 seqno)
 {
-	struct drm_device *dev = engine->dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_i915_private *dev_priv = to_i915(engine->dev);
 
-	if (INTEL_INFO(dev)->gen == 6 || INTEL_INFO(dev)->gen == 7) {
+	if (INTEL_INFO(dev_priv)->gen == 6 || INTEL_INFO(dev_priv)->gen == 7) {
 		I915_WRITE(RING_SYNC_0(engine->mmio_base), 0);
 		I915_WRITE(RING_SYNC_1(engine->mmio_base), 0);
-		if (HAS_VEBOX(dev))
+		if (HAS_VEBOX(dev_priv))
 			I915_WRITE(RING_SYNC_2(engine->mmio_base), 0);
 	}