ARM: Fix return value of arm_find_proc_info
ARM: Fix return value of arm_find_proc_info

Initialize the return value with -1 in order prevent arm_find_proc_info from
returning zero. This could happen in case the environemtn variable
UNW_ARM_UNWIND_METHOD doesn't allow exidx and/or dwarf unwinding.

Signed-off-by: Ken Werner <ae36958ca69fd249ce813d415cd5831a3fb45335@linaro.org>

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