media: mediatek: vcodec: Use kmemdup rather than kmalloc/memcpy

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.
Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_req_lat_if.c

@@ -526,13 +526,12 @@ static int vdec_vp9_slice_init_default_frame_ctx(struct vdec_vp9_slice_instance
 	if (vdec_vp9_slice_default_frame_ctx)
 		goto out;
 
-	frame_ctx = kmalloc(sizeof(*frame_ctx), GFP_KERNEL);
+	frame_ctx = kmemdup(remote_frame_ctx, sizeof(*frame_ctx), GFP_KERNEL);
 	if (!frame_ctx) {
 		ret = -ENOMEM;
 		goto out;
 	}
 
-	memcpy(frame_ctx, remote_frame_ctx, sizeof(*frame_ctx));
 	vdec_vp9_slice_default_frame_ctx = frame_ctx;
 
 out: