Simplify ChangeLog entry for mbedtls_mpi_sub_abs fix.
Bugfix
- * Fix mbedtls_mpi_sub_abs() to account for the possibility that the output
- pointer could equal the first input pointer and if so to skip a memcpy()
- call that would be redundant. Reported by Pascal Cuoq using TrustInSoft
- Analyzer in #6701; observed independently by Aaron Ucko under Valgrind.
+ * Fix potential undefined behavior in mbedtls_mpi_sub_abs(). Reported by
+ Pascal Cuoq using TrustInSoft Analyzer in #6701; observed independently by
+ Aaron Ucko under Valgrind.
