x86_64: fix compilation warning introduced in previous commit
x86_64: fix compilation warning introduced in previous commit

* syscall.c (printcall): Cast x86_64_regs.rip to the type being printed.

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