avcodec/motionpixels: Cleanup generically after init failure

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/motionpixels.c

@@ -81,19 +81,13 @@ static av_cold int mp_decode_init(AVCodecContext *avctx)
     mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
     mp->vpt = av_mallocz_array(avctx->height, sizeof(YuvPixel));
     mp->hpt = av_mallocz_array(h4 / 4, w4 / 4 * sizeof(YuvPixel));
-    if (!mp->changes_map || !mp->vpt || !mp->hpt) {
-        av_freep(&mp->changes_map);
-        av_freep(&mp->vpt);
-        av_freep(&mp->hpt);
+    if (!mp->changes_map || !mp->vpt || !mp->hpt)
         return AVERROR(ENOMEM);
-    }
     avctx->pix_fmt = AV_PIX_FMT_RGB555;
 
     mp->frame = av_frame_alloc();
-    if (!mp->frame) {
-        mp_decode_end(avctx);
+    if (!mp->frame)
         return AVERROR(ENOMEM);
-    }
 
     return 0;
 }
@@ -354,4 +348,5 @@ AVCodec ff_motionpixels_decoder = {
     .close          = mp_decode_end,
     .decode         = mp_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
 };