avformat/oggdec: Initialize return value from ogg_read_page() and check it everywhere
Fixes regression since 9ad47762 Fixes: out of array access Fixes: 22172/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5658535590625280 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegReviewed-by: NLynne <dev@lynne.ee> Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>
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