Treat -ff without -o FILE as single -f
Treat -ff without -o FILE as single -f

* strace.c (init): Treat -ff without -o FILE as single -f.

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

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