avcodec/xan: Cleanup generically on init failure

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/xan.c

@@ -100,16 +100,12 @@ static av_cold int xan_decode_init(AVCodecContext *avctx)
         return AVERROR(ENOMEM);
     s->buffer2_size = avctx->width * avctx->height;
     s->buffer2 = av_malloc(s->buffer2_size + 130);
-    if (!s->buffer2) {
-        av_freep(&s->buffer1);
+    if (!s->buffer2)
         return AVERROR(ENOMEM);
-    }
 
     s->last_frame = av_frame_alloc();
-    if (!s->last_frame) {
-        xan_decode_end(avctx);
+    if (!s->last_frame)
         return AVERROR(ENOMEM);
-    }
 
     return 0;
 }
@@ -649,4 +645,5 @@ AVCodec ff_xan_wc3_decoder = {
     .close          = xan_decode_end,
     .decode         = xan_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
 };