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glcpp: Fix undefined behaviour in glcpp

Jesse Schwartzentruber requested to merge jschwartzentruber/mesa:fix-glcpp-ub into master

Specifically, fix this error (which is covered in existing tests):

../src/compiler/glsl/glcpp/pp.c:198:28: runtime error: applying non-zero offset 1 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../src/compiler/glsl/glcpp/pp.c:198:28 in

Closes: #4477 (closed)

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