beaglebone.c: remove freeing of NULL var
beaglebone.c: remove freeing of NULL var

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

Jon-ICS/mraa,jontrulson/mraa,Kiritoalex/mraa,STANAPO/mraa,allela-roy/mraa,yoyojacky/mraa,SyrianSpock/mraa,sundw2014/mraa,ProfFan/mraa,smileboywtu/mraa,yongli3/mraa,nioinnovation/mraa,andreivasiliu2211/mraa,ProfFan/mraa,whbruce/mraa,stefan-andritoiu/mraa-gpio-chardev,stefan-andritoiu/mraa-gpio-chardev,stefan-andritoiu/mraa-gpio-chardev,sundw2014/mraa,petreeftime/mraa,arunlee77/mraa,nioinnovation/mraa,andreivasiliu2211/mraa,stefan-andritoiu/mraa-gpio-chardev,Propanu/mraa,matt-auld/mraa,malikabhi05/mraa,yoyojacky/mraa,sergev/mraa,intel-iot-devkit/mraa,sundw2014/mraa,stefan-andritoiu/mraa,tripzero/mraa,alext-mkrs/mraa,smileboywtu/mraa,matt-auld/mraa,allela-roy/mraa,ncrastanaren/mraa,SyrianSpock/mraa,Hbrinj/mraa,nioinnovation/mraa,alex1818/mraa,Propanu/mraa,stefan-andritoiu/mraa,malikabhi05/mraa,zBMNForks/mraa,jontrulson/mraa,stefan-andritoiu/mraa,petreeftime/mraa,anonymouse64/mraa,Propanu/mraa,sergev/mraa,neuroidss/mraa,Propanu/mraa,anonymouse64/mraa,stefan-andritoiu/mraa,sundw2014/mraa,w4ilun/mraa,KurtE/mraa,stefan-andritoiu/mraa,sergev/mraa,andreivasiliu2211/mraa,mircea/mraa,neuroidss/mraa,damcclos/mraa,malikabhi05/mraa,Pillar1989/mraa,arfoll/mraa,SyrianSpock/mraa,arfoll/mraa,whbruce/mraa,ncrastanaren/mraa,malikabhi05/mraa,spitfire88/mraa,arfoll/mraa,smileboywtu/mraa,damcclos/mraa,arunlee77/mraa,w4ilun/mraa,mircea/mraa,intel-iot-devkit/mraa,arunlee77/mraa,damcclos/mraa,intel-iot-devkit/mraa,zBMNForks/mraa,g-vidal/mraa,ncrastanaren/mraa,Pillar1989/mraa,jontrulson/mraa,alext-mkrs/mraa,anonymouse64/mraa,alex1818/mraa,Jon-ICS/mraa,Meirtz/mraa,KurtE/mraa,Hbrinj/mraa,petreeftime/mraa,spitfire88/mraa,arunlee77/mraa,w4ilun/mraa,Meirtz/mraa,jontrulson/mraa,alext-mkrs/mraa,KurtE/mraa,ProfFan/mraa,whbruce/mraa,tripzero/mraa,Propanu/mraa,intel-iot-devkit/mraa,KurtE/mraa,w4ilun/mraa,petreeftime/mraa,STANAPO/mraa,malikabhi05/mraa,arfoll/mraa,spitfire88/mraa,spitfire88/mraa,alext-mkrs/mraa,yongli3/mraa,Pillar1989/mraa,ProfFan/mraa,ncrastanaren/mraa,Kiritoalex/mraa,KurtE/mraa,sergev/mraa,matt-auld/mraa,g-vidal/mraa,alex1818/mraa,yoyojacky/mraa,Hbrinj/mraa,yongli3/mraa,ncrastanaren/mraa,yongli3/mraa,allela-roy/mraa,alext-mkrs/mraa,arfoll/mraa,sundw2014/mraa,jontrulson/mraa,Meirtz/mraa,zBMNForks/mraa,neuroidss/mraa,Hbrinj/mraa,mircea/mraa,yongli3/mraa,sergev/mraa,whbruce/mraa,g-vidal/mraa,g-vidal/mraa,Jon-ICS/mraa,andreivasiliu2211/mraa,stefan-andritoiu/mraa-gpio-chardev,STANAPO/mraa,intel-iot-devkit/mraa,tripzero/mraa,Kiritoalex/mraa,g-vidal/mraa