cell_edac: fix missing of_node_put

Decrease device_node refcount np after task completion.

Signed-off-by: Libo Chen <libo.chen@huawei.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
diff --git a/drivers/edac/cell_edac.c b/drivers/edac/cell_edac.c
index c2eaf33..493dc30 100644
--- a/drivers/edac/cell_edac.c
+++ b/drivers/edac/cell_edac.c
@@ -162,6 +162,7 @@
 			csrow->first_page, nr_pages);
 		break;
 	}
+	of_node_put(np);
 }
 
 static int cell_edac_probe(struct platform_device *pdev)