media: v4l2-h264: Sort long refs by pic_num not frame_num

This is a very minor fix to make the code follow the spec. Most of the
streams I have in hand have pic_num == frame_num and otherwise the
order is the same. This also have no impact on the fluster score for
both Hantro and RKVDec drivers.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>

drivers/media/v4l2-core/v4l2-h264.c

@@ -108,8 +108,8 @@ static int v4l2_h264_p_ref_list_cmp(const void *ptra, const void *ptrb,
 	 * ascending order.
 	 */
 	if (!builder->refs[idxa].longterm)
-		return builder->refs[idxb].frame_num <
-		       builder->refs[idxa].frame_num ?
+		return builder->refs[idxb].pic_num <
+		       builder->refs[idxa].pic_num ?
 		       -1 : 1;
 
 	return builder->refs[idxa].pic_num < builder->refs[idxb].pic_num ?