Fixes: NULL pointer dereference
Fixes: 
38125/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XMA1_fuzzer-5151909422432256

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

diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index a4b48b13a8c..7b489943f43 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -1855,7 +1855,7 @@ static int xma_decode_packet(AVCodecContext *avctx, void 
*data,
         eof = 1;
 
         for (i = 0; i < s->num_streams; i++) {
-            if (!s->xma[i].eof_done) {
+            if (!s->xma[i].eof_done && s->frames[i]->data[0]) {
                 ret = decode_packet(avctx, &s->xma[i], s->frames[i],
                                     &got_stream_frame_ptr, avpkt);
             }
-- 
2.17.1

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