l298: fix a potential divied-by-zero
l298: fix a potential divied-by-zero

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

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