Added error handling for calls into libffi (oops)
Added error handling for calls into libffi (oops)

jiakai-lian/libextobjc,sanojnambiar/libextobjc,sunfei/libextobjc,goodheart/libextobjc,WPDreamMelody/libextobjc,KBvsMJ/libextobjc,telly/libextobjc,bboyesc/libextobjc,kolyuchiy/libextobjc,liuruxian/libextobjc,sandyway/libextobjc