drm/i915: Rename drm_gem_object_unreference in preparation for lockless free

Ultimately wraps kref_put(), so adopt its nomenclature for consistency
with other subsystems.

s/drm_gem_object_unreference/i915_gem_object_put/

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1469005202-9659-6-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469017917-15134-5-git-send-email-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 605c696..a6a8fba 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -662,7 +662,7 @@
 	mutex_lock(&dev->struct_mutex);
 	obj = guc_fw->guc_fw_obj;
 	if (obj)
-		drm_gem_object_unreference(&obj->base);
+		i915_gem_object_put(obj);
 	guc_fw->guc_fw_obj = NULL;
 	mutex_unlock(&dev->struct_mutex);
 
@@ -743,7 +743,7 @@
 	i915_guc_submission_fini(dev_priv);
 
 	if (guc_fw->guc_fw_obj)
-		drm_gem_object_unreference(&guc_fw->guc_fw_obj->base);
+		i915_gem_object_put(guc_fw->guc_fw_obj);
 	guc_fw->guc_fw_obj = NULL;
 	mutex_unlock(&dev->struct_mutex);