mpeg4videodec: replace MpegEncContext.reduced_res_vop with a local variable

libavcodec/mpeg4videodec.c

@@ -1946,13 +1946,11 @@ no_cplx_est:
                 skip_bits(gb, 2); /* requested upstream message type */
                 skip_bits1(gb);   /* newpred segment type */
             }
-            s->reduced_res_vop = get_bits1(gb);
-            if (s->reduced_res_vop)
+            if (get_bits1(gb)) // reduced_res_vop
                 av_log(s->avctx, AV_LOG_ERROR,
                        "reduced resolution VOP not supported\n");
         } else {
             s->new_pred        = 0;
-            s->reduced_res_vop = 0;
         }
 
         s->scalability = get_bits1(gb);

libavcodec/mpegvideo.h

@@ -593,7 +593,6 @@ typedef struct MpegEncContext {
     int hierachy_type;
     int enhancement_type;
     int new_pred;
-    int reduced_res_vop;
     int aspect_ratio_info; //FIXME remove
     int sprite_warping_accuracy;
     int data_partitioning;           ///< data partitioning flag from header