decode_select: do not allocate unused memory
decode_select: do not allocate unused memory

* desc.c (decode_select): On entering syscall, do not allocate memory
in non-verbose mode.

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