ppc64: fix compilation warning
ppc64: fix compilation warning

Fix compilation warning introduced by commit
577be2593d4895ef941e1c4e5e1608f7dd13610d

* signal.c (sys_sigreturn) [POWERPC64]: Fix initialization of signal
mask on 32bit personality.

Yu-AndroidM/android_external_strace,AOSP-YU/platform_external_strace,Infinitive-OS/platform_external_strace,Saruta/strace,TeamExodus/external_strace,YUPlayGodDev/platform_external_strace,Saruta/strace,MonkeyZZZZ/platform_external_strace,Saruta/strace,Saruta/strace,geekboxzone/mmallow_external_strace,Infinitive-OS/platform_external_strace,kapdop/android_external_strace,vrastogi/strace,geofft/strace,cuviper/strace,geofft/strace,MonkeyZZZZ/platform_external_strace,MonkeyZZZZ/platform_external_strace,cuviper/strace,Distrotech/strace,YUPlayGodDev/platform_external_strace,cuviper/strace,cuviper/strace,TeamExodus/external_strace,kapdop/android_external_strace,AOSP-YU/platform_external_strace,Yu-AndroidM/android_external_strace,kapdop/android_external_strace,bigzz/strace_android,Distrotech/strace,vrastogi/strace,YUPlayGodDev/platform_external_strace,geekboxzone/mmallow_external_strace,MonkeyZZZZ/platform_external_strace,TeamExodus/external_strace,Saruta/strace,Yu-AndroidM/android_external_strace,geekboxzone/mmallow_external_strace,Infinitive-OS/platform_external_strace,AOSP-YU/platform_external_strace,Yu-AndroidM/android_external_strace,geekboxzone/mmallow_external_strace,geofft/strace,geofft/strace,bigzz/strace_android,Infinitive-OS/platform_external_strace,TeamExodus/external_strace,cuviper/strace,YUPlayGodDev/platform_external_strace,bigzz/strace_android,AOSP-YU/platform_external_strace,kapdop/android_external_strace,TeamExodus/external_strace,Yu-AndroidM/android_external_strace,bigzz/strace_android,vrastogi/strace,Infinitive-OS/platform_external_strace,bigzz/strace_android,vrastogi/strace,AOSP-YU/platform_external_strace,Distrotech/strace,vrastogi/strace,kapdop/android_external_strace,MonkeyZZZZ/platform_external_strace,geofft/strace,YUPlayGodDev/platform_external_strace,Distrotech/strace,Distrotech/strace,geekboxzone/mmallow_external_strace