Fixes: assertion failure
Fixes: 
21666/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_INDEO4_fuzzer-5706468994318336

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/ivi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/ivi.c b/libavcodec/ivi.c
index 7d3749b818b..c5c50fb5c12 100644
--- a/libavcodec/ivi.c
+++ b/libavcodec/ivi.c
@@ -1192,6 +1192,8 @@ int ff_ivi_decode_frame(AVCodecContext *avctx, void 
*data, int *got_frame,
             AVPacket pkt;
             pkt.data = avpkt->data + (get_bits_count(&ctx->gb) >> 3);
             pkt.size = get_bits_left(&ctx->gb) >> 3;
+            ctx->got_p_frame = 0;
+            av_frame_unref(ctx->p_frame);
             ff_ivi_decode_frame(avctx, ctx->p_frame, &ctx->got_p_frame, &pkt);
         }
     }
-- 
2.17.1

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