blink-io: make sure maa_gpio_init was successful
blink-io: make sure maa_gpio_init was successful

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

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