pathtrace: fix umovestr return code check
pathtrace: fix umovestr return code check

* pathtrace.c (upathmatch): Only NUL-terminated strings can be
path-matched, so fix the umovestr return code check to filter out
unsuitable strings.

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