drm/exynos/ipp: remove unused field in command node

Since command node have file pointer dev field became useless.

Signed-off-by: Andrzej Hajda <[e-mail]>
Reviewed-by: Joonyoung Shim <[e-mail]>
Signed-off-by: Inki Dae <[e-mail]>

drivers/gpu/drm/exynos/exynos_drm_ipp.c

···
 		property->prop_id, property->cmd, (int)ippdrv);
 
 	/* stored property information and ippdrv in private data */
-	c_node->dev = dev;
 	c_node->property = *property;
 	c_node->state = IPP_STATE_IDLE;
 	c_node->filp = file;

drivers/gpu/drm/exynos/exynos_drm_ipp.h

···
 /*
  * A structure of command node.
  *
- * @dev: IPP device.
  * @list: list head to command queue information.
  * @event_list: list head of event.
  * @mem_list: list head to source,destination memory queue information.
···
  * @filp: associated file pointer.
  */
 struct drm_exynos_ipp_cmd_node {
-	struct device		*dev;
 	struct list_head	list;
 	struct list_head	event_list;
 	struct list_head	mem_list[EXYNOS_DRM_OPS_MAX];