avcodec/flashsv: add FF_CODEC_CAP_INIT_CLEANUP to flashsv1

Fixes: memleaks on error paths during init
Fixes: 15533/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLASHSV_fuzzer-5647977168764928

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/flashsv.c

@@ -132,7 +132,6 @@ static av_cold int flashsv_decode_init(AVCodecContext *avctx)
 
     s->frame = av_frame_alloc();
     if (!s->frame) {
-        flashsv_decode_end(avctx);
         return AVERROR(ENOMEM);
     }
 
@@ -518,6 +517,7 @@ AVCodec ff_flashsv_decoder = {
     .close          = flashsv_decode_end,
     .decode         = flashsv_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
 };
 #endif /* CONFIG_FLASHSV_DECODER */