media: exynos4-is: add missing call to of_node_put()

In one of the error paths of the for_each_child_of_node() loop in
fimc_md_parse_one_endpoint, add missing call to of_node_put().

Fix the following coccicheck warning:
./drivers/media/platform/exynos4-is/media-dev.c:489:1-23: WARNING:
Function "for_each_child_of_node" should have of_node_put() before
return around line 492.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/exynos4-is/media-dev.c

@@ -488,8 +488,10 @@ static int fimc_md_parse_port_node(struct fimc_md *fmd,
 
 	for_each_child_of_node(port, ep) {
 		ret = fimc_md_parse_one_endpoint(fmd, ep);
-		if (ret < 0)
+		if (ret < 0) {
+			of_node_put(ep);
 			return ret;
+		}
 	}
 
 	return 0;