Bugfix
   * Fix a memory leak in mbedtls_mpi_sub_abs() when the result was negative
     (an error condition) and the second operand was aliased to the result.
   * Fix a case in elliptic curve arithmetic where an out-of-memory condition
     could go undetected, resulting in an incorrect result.

Add changelog entry for the memory management fixes
Add changelog entry for the memory management fixes

Signed-off-by: Gilles Peskine <f805f64266d288fc5467baa7be6cd0ff366f477b@arm.com>
