drm/i915: Remove 'retire' parameter from intel_fb_obj_flush

Setting retire=true is identical to using origin=ORIGIN_CS, so make the
same simplification to intel_fb_obj_flush() as already employed for
intel_fb_obj_invalidate().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170222114049.28456-6-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_gem_clflush.c b/drivers/gpu/drm/i915/i915_gem_clflush.c
index c5fee02..d925fb5 100644
--- a/drivers/gpu/drm/i915/i915_gem_clflush.c
+++ b/drivers/gpu/drm/i915/i915_gem_clflush.c
@@ -74,7 +74,7 @@ static void __i915_do_clflush(struct drm_i915_gem_object *obj)
 	drm_clflush_sg(obj->mm.pages);
 	obj->cache_dirty = false;
 
-	intel_fb_obj_flush(obj, false, ORIGIN_CPU);
+	intel_fb_obj_flush(obj, ORIGIN_CPU);
 }
 
 static void i915_clflush_work(struct work_struct *work)