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Don't store a value read directly from the bitstream in an enum
In this case, the enum only has one single allowed value, while the bitstream can contain a number of different values. Don't load the unchecked value into an enum variable, because storing the disallowed values in the enum variable is undefined behaviour. Instead store it in an int, until the value has been verified to be the allowed one. This fixes undefined behaviour sanitizer errors. Fixes: 23192/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LIBFDK_AAC_fuzzer-5205702892322816 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
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