drm/ttm: cleanup some more resv->lock uses

Use the reservation wrapper for this.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Roger He <Hongbo.He@amd.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 9237099..6e353df 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -485,7 +485,7 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
 	fbo->acc_size = 0;
 	fbo->resv = &fbo->ttm_resv;
 	reservation_object_init(fbo->resv);
-	ret = ww_mutex_trylock(&fbo->resv->lock);
+	ret = reservation_object_trylock(fbo->resv);
 	WARN_ON(!ret);
 
 	*new_obj = fbo;