gpio.c: cast return value explicitly
gpio.c: cast return value explicitly

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

yongli3/mraa,jontrulson/mraa,stefan-andritoiu/mraa-gpio-chardev,STANAPO/mraa,Hbrinj/mraa,zBMNForks/mraa,sundw2014/mraa,seem-sky/mraa,arunlee77/mraa,smileboywtu/mraa,Kiritoalex/mraa,andreivasiliu2211/mraa,Hbrinj/mraa,seem-sky/mraa,mircea/mraa,whbruce/mraa,tripzero/mraa,Kiritoalex/mraa,stefan-andritoiu/mraa,arunlee77/mraa,spitfire88/mraa,intel-iot-devkit/mraa,noahchense/mraa,petreeftime/mraa,andreivasiliu2211/mraa,w4ilun/mraa,alexandru-elisei/mraa,petreeftime/mraa,whbruce/mraa,noahchense/mraa,allela-roy/mraa,spitfire88/mraa,sergev/mraa,KurtE/mraa,malikabhi05/mraa,arunlee77/mraa,sergev/mraa,stefan-andritoiu/mraa,g-vidal/mraa,allela-roy/mraa,Propanu/mraa,sundw2014/mraa,mircea/mraa,neuberfran/mraa,yongli3/mraa,intel-iot-devkit/mraa,jontrulson/mraa,Meirtz/mraa,zBMNForks/mraa,tripzero/mraa,alext-mkrs/mraa,g-vidal/mraa,sundw2014/mraa,stefan-andritoiu/mraa,Propanu/mraa,alext-mkrs/mraa,yongli3/mraa,yongli3/mraa,stefan-andritoiu/mraa-gpio-chardev,SyrianSpock/mraa,arunlee77/mraa,alex1818/mraa,sundw2014/mraa,STANAPO/mraa,neuberfran/mraa,ProfFan/mraa,jontrulson/mraa,Pillar1989/mraa,noahchense/mraa,whbruce/mraa,yoyojacky/mraa,alexandru-elisei/mraa,yoyojacky/mraa,ncrastanaren/mraa,KurtE/mraa,andreivasiliu2211/mraa,stefan-andritoiu/mraa,tripzero/mraa,w4ilun/mraa,neuberfran/mraa,Pillar1989/mraa,Jon-ICS/mraa,stefan-andritoiu/mraa,yongli3/mraa,malikabhi05/mraa,w4ilun/mraa,Propanu/mraa,malikabhi05/mraa,intel-iot-devkit/mraa,anonymouse64/mraa,Meirtz/mraa,seem-sky/mraa,sundw2014/mraa,sergev/mraa,nioinnovation/mraa,Jon-ICS/mraa,jontrulson/mraa,stefan-andritoiu/mraa-gpio-chardev,jontrulson/mraa,spitfire88/mraa,timrtoo/Intel,whbruce/mraa,neuroidss/mraa,matt-auld/mraa,zBMNForks/mraa,alext-mkrs/mraa,Hbrinj/mraa,arfoll/mraa,timrtoo/Intel,timrtoo/Intel,sergev/mraa,intel-iot-devkit/mraa,noahchense/mraa,anonymouse64/mraa,sergev/mraa,KurtE/mraa,g-vidal/mraa,alex1818/mraa,matt-auld/mraa,neuberfran/mraa,Hbrinj/mraa,malikabhi05/mraa,stefan-andritoiu/mraa-gpio-chardev,petreeftime/mraa,pctj101/mraa,alexandru-elisei/mraa,arfoll/mraa,andreivasiliu2211/mraa,timrtoo/Intel,w4ilun/mraa,ProfFan/mraa,arfoll/mraa,damcclos/mraa,pctj101/mraa,noahchense/mraa,g-vidal/mraa,g-vidal/mraa,spitfire88/mraa,SyrianSpock/mraa,timrtoo/Intel,matt-auld/mraa,arfoll/mraa,ProfFan/mraa,mircea/mraa,pctj101/mraa,nioinnovation/mraa,SyrianSpock/mraa,ncrastanaren/mraa,arfoll/mraa,intel-iot-devkit/mraa,nioinnovation/mraa,neuberfran/mraa,Propanu/mraa,Meirtz/mraa,ProfFan/mraa,seem-sky/mraa,seem-sky/mraa,alex1818/mraa,alexandru-elisei/mraa,Jon-ICS/mraa,Kiritoalex/mraa,petreeftime/mraa,allela-roy/mraa,KurtE/mraa,pctj101/mraa,smileboywtu/mraa,malikabhi05/mraa,Propanu/mraa,stefan-andritoiu/mraa-gpio-chardev,STANAPO/mraa,neuroidss/mraa,yoyojacky/mraa,alexandru-elisei/mraa,Pillar1989/mraa,ncrastanaren/mraa,pctj101/mraa,KurtE/mraa,ncrastanaren/mraa,anonymouse64/mraa,smileboywtu/mraa,ncrastanaren/mraa,damcclos/mraa,alext-mkrs/mraa,alext-mkrs/mraa,damcclos/mraa,neuroidss/mraa