prevent invalid values in Channel's PixelType enum #785
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Avoid 'undefined behavior' sanitizer warnings when reading invalid PixelTypes, as reported in https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24021
Overall behavior not changed: files with invalid PixelTypes will cause an exception to be thrown from constructor via Header::sanityCheck, as before
Signed-off-by: Peter Hillman peterh@wetafx.co.nz