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asn1_object_id_der: Fix UB due to null pointer arithmetic

Roman Bolshakov requested to merge roolebo/libtasn1:fix-arithmetic-on-null-pointers into master

This is an alternative fix for #30 (closed). It doesn't introduce a dummy variable.

Checklist

  • Code modified for feature
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated

Reviewer's checklist:

  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent with other code
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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