fixed potential ASPINRemoteImageDownloader crash (#1972)
fixed potential ASPINRemoteImageDownloader crash (#1972)


jellenbogen/AsyncDisplayKit,bimawa/AsyncDisplayKit,lappp9/AsyncDisplayKit,harryworld/AsyncDisplayKit,facebook/AsyncDisplayKit,maicki/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,levi/AsyncDisplayKit,JetZou/AsyncDisplayKit,JetZou/AsyncDisplayKit,maicki/AsyncDisplayKit,facebook/AsyncDisplayKit,smyrgl/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,gazreese/AsyncDisplayKit,facebook/AsyncDisplayKit,levi/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,gazreese/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,romyilano/AsyncDisplayKit,romyilano/AsyncDisplayKit,smyrgl/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,levi/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,bimawa/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,harryworld/AsyncDisplayKit,facebook/AsyncDisplayKit,levi/AsyncDisplayKit,flovouin/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,bimawa/AsyncDisplayKit,harryworld/AsyncDisplayKit,harryworld/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,flovouin/AsyncDisplayKit,george-gw/AsyncDisplayKit,rmls/AsyncDisplayKit,george-gw/AsyncDisplayKit,rmls/AsyncDisplayKit,smyrgl/AsyncDisplayKit,flovouin/AsyncDisplayKit,lappp9/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,samhsiung/AsyncDisplayKit,flovouin/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,maicki/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,harryworld/AsyncDisplayKit,flovouin/AsyncDisplayKit,JetZou/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,JetZou/AsyncDisplayKit,smyrgl/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,romyilano/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,romyilano/AsyncDisplayKit,JetZou/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,bimawa/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,george-gw/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,lappp9/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,samhsiung/AsyncDisplayKit,george-gw/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,samhsiung/AsyncDisplayKit,lappp9/AsyncDisplayKit,rmls/AsyncDisplayKit,rmls/AsyncDisplayKit,gazreese/AsyncDisplayKit,maicki/AsyncDisplayKit,samhsiung/AsyncDisplayKit,levi/AsyncDisplayKit,maicki/AsyncDisplayKit,gazreese/AsyncDisplayKit,rmls/AsyncDisplayKit