Fixes: timeout(>20sec -> 1ms)
Fixes: 
26526/clusterfuzz-testcase-minimized-ffmpeg_dem_EA_fuzzer-5672328069120000

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

diff --git a/libavformat/electronicarts.c b/libavformat/electronicarts.c
index d0f483aaf9..4c292f29a2 100644
--- a/libavformat/electronicarts.c
+++ b/libavformat/electronicarts.c
@@ -582,6 +582,8 @@ static int ea_read_packet(AVFormatContext *s, AVPacket *pkt)
     int av_uninit(num_samples);
 
     while ((!packet_read && !hit_end) || partial_packet) {
+        if (avio_feof(pb))
+            return AVERROR_EOF;
         chunk_type = avio_rl32(pb);
         chunk_size = ea->big_endian ? avio_rb32(pb) : avio_rl32(pb);
         if (chunk_size < 8)
-- 
2.17.1

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