up.c: Remove warnings about unsigned ints being passed
up.c: Remove warnings about unsigned ints being passed

Whilst not the cleanest and the headers could do with an update, this is a
short term solution to stop the warnings

Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

andreivasiliu2211/mraa,arunlee77/mraa,stefan-andritoiu/mraa-gpio-chardev,whbruce/mraa,stefan-andritoiu/mraa-gpio-chardev,alext-mkrs/mraa,stefan-andritoiu/mraa-gpio-chardev,Propanu/mraa,malikabhi05/mraa,KurtE/mraa,ncrastanaren/mraa,ProfFan/mraa,andreivasiliu2211/mraa,arfoll/mraa,ProfFan/mraa,arfoll/mraa,spitfire88/mraa,sergev/mraa,Pillar1989/mraa,alext-mkrs/mraa,jontrulson/mraa,Propanu/mraa,sergev/mraa,ncrastanaren/mraa,yongli3/mraa,whbruce/mraa,intel-iot-devkit/mraa,intel-iot-devkit/mraa,yongli3/mraa,arunlee77/mraa,stefan-andritoiu/mraa-gpio-chardev,g-vidal/mraa,jontrulson/mraa,alext-mkrs/mraa,ncrastanaren/mraa,g-vidal/mraa,yongli3/mraa,sergev/mraa,Propanu/mraa,stefan-andritoiu/mraa-gpio-chardev,stefan-andritoiu/mraa,arfoll/mraa,stefan-andritoiu/mraa,malikabhi05/mraa,jontrulson/mraa,spitfire88/mraa,Propanu/mraa,ncrastanaren/mraa,andreivasiliu2211/mraa,g-vidal/mraa,malikabhi05/mraa,intel-iot-devkit/mraa,sergev/mraa,arfoll/mraa,alext-mkrs/mraa,petreeftime/mraa,Propanu/mraa,Jon-ICS/mraa,Jon-ICS/mraa,alext-mkrs/mraa,malikabhi05/mraa,sergev/mraa,stefan-andritoiu/mraa,w4ilun/mraa,malikabhi05/mraa,ProfFan/mraa,Hbrinj/mraa,whbruce/mraa,KurtE/mraa,intel-iot-devkit/mraa,andreivasiliu2211/mraa,petreeftime/mraa,ncrastanaren/mraa,yongli3/mraa,jontrulson/mraa,yongli3/mraa,stefan-andritoiu/mraa,jontrulson/mraa,Hbrinj/mraa,g-vidal/mraa,Pillar1989/mraa,petreeftime/mraa,intel-iot-devkit/mraa,spitfire88/mraa,KurtE/mraa,g-vidal/mraa,arfoll/mraa,w4ilun/mraa,petreeftime/mraa,arunlee77/mraa,KurtE/mraa,Jon-ICS/mraa,whbruce/mraa,Hbrinj/mraa,ProfFan/mraa,Pillar1989/mraa,spitfire88/mraa,arunlee77/mraa,w4ilun/mraa,stefan-andritoiu/mraa,Hbrinj/mraa,w4ilun/mraa,KurtE/mraa