of: remove redundant memset in overlay

memset in of_build_overlay_info is redundant, the ovinfo has been
zeroed in of_fill_overlay_info when error.

Signed-off-by: YiPing Xu <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

drivers/of/overlay.c

···
 
 	cnt = 0;
 	for_each_child_of_node(tree, node) {
-		memset(&ovinfo[cnt], 0, sizeof(*ovinfo));
 		err = of_fill_overlay_info(ov, node, &ovinfo[cnt]);
 		if (err == 0)
 			cnt++;