alacenc: don't allocate unused avctx->coded_frame

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/alacenc.c

@@ -483,7 +483,6 @@ static av_cold int alac_encode_close(AVCodecContext *avctx)
     ff_lpc_end(&s->lpc_ctx);
     av_freep(&avctx->extradata);
     avctx->extradata_size = 0;
-    av_freep(&avctx->coded_frame);
     return 0;
 }
 
@@ -579,12 +578,6 @@ static av_cold int alac_encode_init(AVCodecContext *avctx)
         goto error;
     }
 
-    avctx->coded_frame = avcodec_alloc_frame();
-    if (!avctx->coded_frame) {
-        ret = AVERROR(ENOMEM);
-        goto error;
-    }
-
     s->avctx = avctx;
 
     if ((ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,