Undefined Behavior in GfxFont.cc parseCharName()

During fuzzing by X41 D-Sec, UndefinedBehaviorSanitizer warns about the following code position in parseCharName():

poppler/poppler/poppler/GfxFont.cc:1458:32: runtime error: applying non-zero offset 1 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /poppler/poppler/poppler/GfxFont.cc:1458:32 in

In edge cases, this undefined behavior appears to be reachable and can therefore cause unspecified issues depending on the compiler. The exact function call parameters were not recorded.

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