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During decoding, when an image decoder is encountered, any
subsequent decoders are ignored, but remain in the array. However,
later on CPDF_DIBSource::ValidateDictParam expects the image
decoder to be the last in the array, causing issues.
A check is also added in CPDF_DIBSource::GetScanline to ensure
that the calculated pitch value is <= the (4-aligned) pitch value in the
cached bitmap to prevent future issues.
Also cleans up some NULL usages.
BUG=552046
R=jun_fang@foxitsoftware.com, tsepez@chromium.org
Review URL: https://codereview.chromium.org/1406943005 .
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