firmata.c: Remove superfleous debug output
firmata.c: Remove superfleous debug output

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

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