Lerc2::ReadTile(): avoid index out-of-bound error on corrupted file. Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9278. Credit to OSS Fuzz
Lerc2::ReadTile(): avoid index out-of-bound error on corrupted file. Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9278. Credit to OSS Fuzz

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