roqvideoenc: Drop unneeded initialization

Its fields are never initialized to begin with.

libavcodec/roqvideoenc.c

@@ -955,8 +955,6 @@ static int roq_encode_video(RoqContext *enc)
     reconstruct_and_encode_image(enc, tempData, enc->width, enc->height,
                                  enc->width*enc->height/64);
 
-    enc->avctx->coded_frame = enc->current_frame;
-
     /* Rotate frame history */
     FFSWAP(AVFrame *, enc->current_frame, enc->last_frame);
     FFSWAP(motion_vect *, enc->last_motion4, enc->this_motion4);