avcodec/cbs_av1: fix reading reference order hint in skip_mode_params()

Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/cbs_av1_syntax_template.c

@@ -882,7 +882,7 @@ static int FUNC(skip_mode_params)(CodedBitstreamContext *ctx, RWContext *rw,
         forward_idx  = -1;
         backward_idx = -1;
         for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
-            ref_hint = priv->ref[i].order_hint;
+            ref_hint = priv->ref[current->ref_frame_idx[i]].order_hint;
             dist = cbs_av1_get_relative_dist(seq, ref_hint,
                                              current->order_hint);
             if (dist < 0) {
@@ -913,7 +913,7 @@ static int FUNC(skip_mode_params)(CodedBitstreamContext *ctx, RWContext *rw,
 
             second_forward_idx = -1;
             for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
-                ref_hint = priv->ref[i].order_hint;
+                ref_hint = priv->ref[current->ref_frame_idx[i]].order_hint;
                 if (cbs_av1_get_relative_dist(seq, ref_hint,
                                               forward_hint) < 0) {
                     if (second_forward_idx < 0 ||