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Avoid creating an out-of-bounds pointer by rewriting a check

Alexander Richardson requested to merge arichardson/libxml2:avoid-creating-oob-pointer into master

Creating more than one-past-the-end pointers is undefined behaviour in C and while this code is unlikely to be miscompiled, I discovered that an out-of-bounds pointer is being created using UBSan on a CHERI-enabled system.

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