Fix two minor compiler-warnings.
Fix two minor compiler-warnings.

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