unwind: refactor stacktrace_walk
unwind: refactor stacktrace_walk

* unwind.c (stacktrace_walk): Move stack frame printing code
to separate function print_stack_frame.

vrastogi/strace,geekboxzone/mmallow_external_strace,AOSP-YU/platform_external_strace,xin3liang/platform_external_strace,Saruta/strace,geekboxzone/mmallow_external_strace,Yu-AndroidM/android_external_strace,MonkeyZZZZ/platform_external_strace,kapdop/android_external_strace,xin3liang/platform_external_strace,cuviper/strace,TeamExodus/external_strace,vrastogi/strace,DirtyUnicorns/android_external_strace,vrastogi/strace,android-ia/platform_external_strace,geofft/strace,vrastogi/strace,CyanogenMod/android_external_strace,YUPlayGodDev/platform_external_strace,geekboxzone/mmallow_external_strace,bnoordhuis/strace,bnoordhuis/strace,geekboxzone/lollipop_external_strace,Infinitive-OS/platform_external_strace,cuviper/strace,Yu-AndroidM/android_external_strace,Distrotech/strace,YUPlayGodDev/platform_external_strace,DirtyUnicorns/android_external_strace,bnoordhuis/strace,lkundrak/strace,kapdop/android_external_strace,Distrotech/strace,android-ia/platform_external_strace,Saruta/strace,TeamExodus/external_strace,Distrotech/strace,xin3liang/platform_external_strace,bigzz/strace_android,Distrotech/strace,bigzz/strace_android,cuviper/strace,cuviper/strace,TeamExodus/external_strace,geekboxzone/mmallow_external_strace,Infinitive-OS/platform_external_strace,MonkeyZZZZ/platform_external_strace,xin3liang/platform_external_strace,Infinitive-OS/platform_external_strace,Yu-AndroidM/android_external_strace,bnoordhuis/strace,cuviper/strace,CyanogenMod/android_external_strace,AOSP-YU/platform_external_strace,geekboxzone/mmallow_external_strace,android-ia/platform_external_strace,lkundrak/strace,kapdop/android_external_strace,android-ia/platform_external_strace,Infinitive-OS/platform_external_strace,Saruta/strace,MonkeyZZZZ/platform_external_strace,CyanogenMod/android_external_strace,android-ia/platform_external_strace,geofft/strace,bigzz/strace_android,Yu-AndroidM/android_external_strace,Saruta/strace,Yu-AndroidM/android_external_strace,YUPlayGodDev/platform_external_strace,Saruta/strace,YUPlayGodDev/platform_external_strace,AOSP-YU/platform_external_strace,geekboxzone/lollipop_external_strace,AOSP-YU/platform_external_strace,AOSP-YU/platform_external_strace,geofft/strace,geekboxzone/lollipop_external_strace,kapdop/android_external_strace,geofft/strace,YUPlayGodDev/platform_external_strace,MonkeyZZZZ/platform_external_strace,TeamExodus/external_strace,bigzz/strace_android,CyanogenMod/android_external_strace,geekboxzone/lollipop_external_strace,lkundrak/strace,MonkeyZZZZ/platform_external_strace,Distrotech/strace,Infinitive-OS/platform_external_strace,vrastogi/strace,lkundrak/strace,TeamExodus/external_strace,DirtyUnicorns/android_external_strace,DirtyUnicorns/android_external_strace,DirtyUnicorns/android_external_strace,kapdop/android_external_strace,geekboxzone/lollipop_external_strace,geofft/strace,CyanogenMod/android_external_strace,bigzz/strace_android