<commit_before>Bugfix
   * Fix a null pointer dereference when performing some operations on zero
     represented with 0 limbs: mbedtls_mpi_mod_int() dividing by 2, or
     mbedtls_mpi_write_string() in base 2.<commit_msg>Clarify potential ambiguity in changelog entry<commit_after>Bugfix
   * Fix a null pointer dereference when performing some operations on zero
     represented with 0 limbs (specifically mbedtls_mpi_mod_int() dividing
     by 2, and mbedtls_mpi_write_string() in base 2).
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