Fix a compiler warning
Fix a compiler warning

djwatson/libunwind,rantala/libunwind,atanasyan/libunwind,cloudius-systems/libunwind,rogwfu/libunwind,geekboxzone/lollipop_external_libunwind,olibc/libunwind,igprof/libunwind,CyanogenMod/android_external_libunwind,jrmuizel/libunwind,joyent/libunwind,atanasyan/libunwind,vegard/libunwind,yuyichao/libunwind,frida/libunwind,SyndicateRogue/libunwind,wdv4758h/libunwind,bo-on-software/libunwind,project-zerus/libunwind,Chilledheart/libunwind,fillexen/libunwind,unkadoug/libunwind,pathscale/libunwind,unkadoug/libunwind,Chilledheart/libunwind,android-ia/platform_external_libunwind,vtjnash/libunwind,martyone/libunwind,krytarowski/libunwind,mpercy/libunwind,zeldin/platform_external_libunwind,bo-on-software/libunwind,android-ia/platform_external_libunwind,project-zerus/libunwind,tkelman/libunwind,androidarmv6/android_external_libunwind,evaautomation/libunwind,tony/libunwind,yuyichao/libunwind,dreal-deps/libunwind,atanasyan/libunwind-android,DroidSim/platform_external_libunwind,rantala/libunwind,atanasyan/libunwind,dagar/libunwind,rntz/libunwind,yuyichao/libunwind,krytarowski/libunwind,rantala/libunwind,vegard/libunwind,zliu2014/libunwind-tilegx,mpercy/libunwind,evaautomation/libunwind,igprof/libunwind,frida/libunwind,wdv4758h/libunwind,krytarowski/libunwind,olibc/libunwind,lat/libunwind,libunwind/libunwind,adsharma/libunwind,pathscale/libunwind,pathscale/libunwind,0xlab/0xdroid-external_libunwind,zliu2014/libunwind-tilegx,zeldin/platform_external_libunwind,geekboxzone/mmallow_external_libunwind,mpercy/libunwind,lat/libunwind,Chilledheart/libunwind,SyndicateRogue/libunwind,tkelman/libunwind,DroidSim/platform_external_libunwind,joyent/libunwind,joyent/libunwind,geekboxzone/lollipop_external_libunwind,djwatson/libunwind,rogwfu/libunwind,androidarmv6/android_external_libunwind,geekboxzone/mmallow_external_libunwind,evaautomation/libunwind,maltek/platform_external_libunwind,ehsan/libunwind,cloudius-systems/libunwind,dagar/libunwind,dropbox/libunwind,fillexen/libunwind,igprof/libunwind,tony/libunwind,CyanogenMod/android_external_libunwind,libunwind/libunwind,dropbox/libunwind,androidarmv6/android_external_libunwind,djwatson/libunwind,frida/libunwind,cloudius-systems/libunwind,maltek/platform_external_libunwind,tronical/libunwind,atanasyan/libunwind-android,project-zerus/libunwind,dagar/libunwind,ehsan/libunwind,maltek/platform_external_libunwind,bo-on-software/libunwind,fdoray/libunwind,vegard/libunwind,fillexen/libunwind,geekboxzone/mmallow_external_libunwind,atanasyan/libunwind-android,martyone/libunwind,cms-externals/libunwind,zliu2014/libunwind-tilegx,lat/libunwind,jrmuizel/libunwind,zeldin/platform_external_libunwind,CyanogenMod/android_external_libunwind,dreal-deps/libunwind,rogwfu/libunwind,0xlab/0xdroid-external_libunwind,tronical/libunwind,cms-externals/libunwind,tkelman/libunwind,Keno/libunwind,dreal-deps/libunwind,adsharma/libunwind,Keno/libunwind,rntz/libunwind,dropbox/libunwind,android-ia/platform_external_libunwind,0xlab/0xdroid-external_libunwind,SyndicateRogue/libunwind,martyone/libunwind,vtjnash/libunwind,tronical/libunwind,geekboxzone/lollipop_external_libunwind,fdoray/libunwind,tony/libunwind,adsharma/libunwind,jrmuizel/libunwind,wdv4758h/libunwind,ehsan/libunwind,olibc/libunwind,vtjnash/libunwind,fdoray/libunwind,rntz/libunwind,libunwind/libunwind,cms-externals/libunwind,Keno/libunwind,DroidSim/platform_external_libunwind,unkadoug/libunwind