Simplify SIGCHLD handler setting
Simplify SIGCHLD handler setting

* strace.c (init): Set SIGCHLD to SIG_DFL earlier.
(startup_child): Do not bother restoring SIGCHLD handler.

Signed-off-by: Denys Vlasenko <42afb3a19136e88700e8b77002ea6a5a94c16782@googlemail.com>

geekboxzone/mmallow_external_strace,jamel/strace-plus,Andrey9kin/revisor,Distrotech/strace,xin3liang/platform_external_strace,android-ia/platform_external_strace,jamel/strace-plus,bnoordhuis/strace,geekboxzone/mmallow_external_strace,geekboxzone/lollipop_external_strace,xin3liang/platform_external_strace,android-ia/platform_external_strace,gcode-mirror/strace-plus,MonkeyZZZZ/platform_external_strace,Saruta/strace,Infinitive-OS/platform_external_strace,bigzz/strace_android,Yu-AndroidM/android_external_strace,MonkeyZZZZ/platform_external_strace,pombredanne/strace,gcode-mirror/strace-plus,YUPlayGodDev/platform_external_strace,AOSP-YU/platform_external_strace,TeamExodus/external_strace,bigzz/strace_android,Infinitive-OS/platform_external_strace,lkundrak/strace,geofft/strace,YUPlayGodDev/platform_external_strace,MonkeyZZZZ/platform_external_strace,vrastogi/strace,cuviper/strace,Saruta/strace,AOSP-YU/platform_external_strace,Distrotech/strace,lizh06/strace-plus,Infinitive-OS/platform_external_strace,MonkeyZZZZ/platform_external_strace,Yu-AndroidM/android_external_strace,gcode-mirror/strace-plus,geofft/strace,Andrey9kin/revisor,Yu-AndroidM/android_external_strace,xin3liang/platform_external_strace,lizh06/strace-plus,pombredanne/strace,android-ia/platform_external_strace,bnoordhuis/strace,YUPlayGodDev/platform_external_strace,cuviper/strace,bigzz/strace_android,cuviper/strace,lizh06/strace-plus,Infinitive-OS/platform_external_strace,DirtyUnicorns/android_external_strace,CyanogenMod/android_external_strace,TeamExodus/external_strace,gcode-mirror/strace-plus,pgbovine/strace-plus,lizh06/strace-plus,Andrey9kin/revisor,pgbovine/strace-plus,geofft/strace,Infinitive-OS/platform_external_strace,DirtyUnicorns/android_external_strace,bigzz/strace_android,lkundrak/strace,AOSP-YU/platform_external_strace,android-ia/platform_external_strace,bnoordhuis/strace,geekboxzone/mmallow_external_strace,bnoordhuis/strace,Saruta/strace,kapdop/android_external_strace,geekboxzone/lollipop_external_strace,kapdop/android_external_strace,geofft/strace,geekboxzone/lollipop_external_strace,Distrotech/strace,pgbovine/strace-plus,Saruta/strace,geekboxzone/mmallow_external_strace,CyanogenMod/android_external_strace,TeamExodus/external_strace,AOSP-YU/platform_external_strace,jamel/strace-plus,cuviper/strace,pombredanne/strace,Yu-AndroidM/android_external_strace,CyanogenMod/android_external_strace,DirtyUnicorns/android_external_strace,geofft/strace,lkundrak/strace,YUPlayGodDev/platform_external_strace,vrastogi/strace,Distrotech/strace,CyanogenMod/android_external_strace,jamel/strace-plus,pombredanne/strace,bigzz/strace_android,Andrey9kin/revisor,lkundrak/strace,cuviper/strace,kapdop/android_external_strace,vrastogi/strace,geekboxzone/lollipop_external_strace,vrastogi/strace,geekboxzone/lollipop_external_strace,gcode-mirror/strace-plus,xin3liang/platform_external_strace,pgbovine/strace-plus,TeamExodus/external_strace,vrastogi/strace,kapdop/android_external_strace,DirtyUnicorns/android_external_strace,Saruta/strace,CyanogenMod/android_external_strace,lizh06/strace-plus,DirtyUnicorns/android_external_strace,TeamExodus/external_strace,Distrotech/strace,pgbovine/strace-plus,Yu-AndroidM/android_external_strace,geekboxzone/mmallow_external_strace,kapdop/android_external_strace,android-ia/platform_external_strace,MonkeyZZZZ/platform_external_strace,YUPlayGodDev/platform_external_strace,AOSP-YU/platform_external_strace,jamel/strace-plus