drm/exynos/ipp: fix error return code

Propagate the returned error code on failure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
{ ... return ret; }
|
ret = 0
)
... when != ret = e1
when != &ret
*if(...)
{
... when != ret = e2
when forall
return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <[e-mail]>
Signed-off-by: Inki Dae <[e-mail]>

drivers/gpu/drm/exynos/exynos_drm_ipp.c

···
 	c_node->start_work = ipp_create_cmd_work();
 	if (IS_ERR(c_node->start_work)) {
 		DRM_ERROR("failed to create start work.\n");
+		ret = PTR_ERR(c_node->start_work);
 		goto err_remove_id;
 	}
 
 	c_node->stop_work = ipp_create_cmd_work();
 	if (IS_ERR(c_node->stop_work)) {
 		DRM_ERROR("failed to create stop work.\n");
+		ret = PTR_ERR(c_node->stop_work);
 		goto err_free_start;
 	}
 
 	c_node->event_work = ipp_create_event_work();
 	if (IS_ERR(c_node->event_work)) {
 		DRM_ERROR("failed to create event work.\n");
+		ret = PTR_ERR(c_node->event_work);
 		goto err_free_stop;
 	}