bacnetmstp: fix compiler warnings when building python wrappers
bacnetmstp: fix compiler warnings when building python wrappers

Signed-off-by: Jon Trulson <08664b19c2d4086eb239dd8ec32d593676a5b9e4@ics.com>

nitirohilla/upm,g-vidal/upm,stefan-andritoiu/upm,g-vidal/upm,jontrulson/upm,whbruce/upm,pylbert/upm,pylbert/upm,nitirohilla/upm,skiselev/upm,malikabhi05/upm,sasmita/upm,sasmita/upm,whbruce/upm,spitfire88/upm,intel-iot-devkit/upm,Jon-ICS/upm,malikabhi05/upm,Propanu/upm,intel-iot-devkit/upm,nitirohilla/upm,spitfire88/upm,stefan-andritoiu/upm,sasmita/upm,pylbert/upm,Jon-ICS/upm,stefan-andritoiu/upm,Propanu/upm,whbruce/upm,jontrulson/upm,spitfire88/upm,g-vidal/upm,skiselev/upm,sasmita/upm,intel-iot-devkit/upm,skiselev/upm,Propanu/upm,intel-iot-devkit/upm,nitirohilla/upm,Jon-ICS/upm,skiselev/upm,intel-iot-devkit/upm,Propanu/upm,stefan-andritoiu/upm,spitfire88/upm,skiselev/upm,intel-iot-devkit/upm,skiselev/upm,stefan-andritoiu/upm,whbruce/upm,jontrulson/upm,sasmita/upm,Propanu/upm,jontrulson/upm,spitfire88/upm,pylbert/upm,g-vidal/upm,jontrulson/upm,malikabhi05/upm,pylbert/upm,malikabhi05/upm,stefan-andritoiu/upm,Jon-ICS/upm,nitirohilla/upm,g-vidal/upm,malikabhi05/upm,malikabhi05/upm,pylbert/upm,g-vidal/upm,whbruce/upm,Jon-ICS/upm,Propanu/upm