Fix same integer overflow in deep tiled sample count corruption check.
Fix same integer overflow in deep tiled sample count corruption check.

oglops/IlmBase,oglops/IlmBase,oglops/OpenEXR,oglops/OpenEXR,oglops/IlmBase,oglops/PyIlmBase,oglops/OpenEXR,oglops/PyIlmBase,oglops/PyIlmBase,oglops/PyIlmBase