tools/target_dec_fuzzer: Fix return code on open failure
authorMichael Niedermayer <michael@niedermayer.cc>
Thu, 27 Apr 2017 00:18:03 +0000 (02:18 +0200)
committerMichael Niedermayer <michael@niedermayer.cc>
Thu, 27 Apr 2017 02:25:31 +0000 (04:25 +0200)
Fixes: 1271/clusterfuzz-testcase-minimized-6095220498235392

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

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