tinfl_decompress: avoid NULL ptr arithmetic UB:
tinfl_decompress: avoid NULL ptr arithmetic UB:

Fixes: https://github.com/richgel999/miniz/issues/216

Also see:
https://github.com/mitkus/miniz/commit/6b8c30e4a95dd649adf14cf4bcad90701e323b9a

richgel999/miniz,richgel999/miniz,richgel999/miniz