Simplify zone_good_size().
Simplify zone_good_size().

Simplify zone_good_size() to avoid memory allocation.

Submitted by Mike Hommey.

lilothar/jemalloc,splbio/jemalloc,geekboxzone/lollipop_external_jemalloc,shekkbuilder/jemalloc,percona/jemalloc-debian,8l/jemalloc,dxq-git/jemalloc,wqfish/jemalloc,cpeterso/jemalloc,leebaok/jemalloc-4.2.1-readcode,vashstorm/jemalloc,wqfish/jemalloc,flyfeifan/jemalloc,wespelee/jemalloc,dxq-git/jemalloc,Snaipe/jemalloc,garoose/jemalloc,yy-nm/jemalloc,geekboxzone/mmallow_external_jemalloc,lvfeng1130/jemalloc,vashstorm/jemalloc,Snaipe/jemalloc,geekboxzone/lollipop_external_jemalloc,Dmitry-Me/jemalloc,splbio/jemalloc,awreece/jemalloc,percona/jemalloc-debian,shekkbuilder/jemalloc,percona/jemalloc-debian,tempbottle/jemalloc,tempbottle/jemalloc,kmiku7/jemalloc,8l/jemalloc,lilothar/jemalloc,8l/jemalloc,geekboxzone/mmallow_external_jemalloc,kmiku7/jemalloc,jemalloc/jemalloc-cmake,Dmitry-Me/jemalloc,wespelee/jemalloc,kmiku7/jemalloc,Dmitry-Me/jemalloc,Snaipe/jemalloc,xin3liang/platform_external_jemalloc,shekkbuilder/jemalloc,lilothar/jemalloc,Dmitry-Me/jemalloc,dxq-git/jemalloc,CyanogenMod/android_external_jemalloc,xin3liang/platform_external_jemalloc,sudosurootdev/external_jemalloc,jemalloc/jemalloc-cmake,wfxiang08/jemalloc,leebaok/jemalloc-4.2.1-readcode,glandium/jemalloc,wfxiang08/jemalloc,TeamExodus/external_jemalloc,VRToxin/android_external_jemalloc,geekboxzone/mmallow_external_jemalloc,shekkbuilder/jemalloc,CMRemix/android_external_jemalloc,geekboxzone/lollipop_external_jemalloc,geekboxzone/mmallow_external_jemalloc,yy-nm/jemalloc,yy-nm/jemalloc,garoose/jemalloc,ahmetmircik/jemalloc,sudosurootdev/external_jemalloc,splbio/jemalloc,CMRemix/android_external_jemalloc,sudosurootdev/external_jemalloc,garoose/jemalloc,cpeterso/jemalloc,awreece/jemalloc,kmiku7/jemalloc,percona/jemalloc-debian,wespelee/jemalloc,tempbottle/jemalloc,TeamExodus/external_jemalloc,8l/jemalloc,CyanogenMod/android_external_jemalloc,CyanogenMod/android_external_jemalloc,VRToxin/android_external_jemalloc,flyfeifan/jemalloc,TeamExodus/external_jemalloc,xin3liang/platform_external_jemalloc,glandium/jemalloc,wqfish/jemalloc,flyfeifan/jemalloc,wqfish/jemalloc,CMRemix/android_external_jemalloc,lilothar/jemalloc,TeamExodus/external_jemalloc,CMRemix/android_external_jemalloc,VRToxin/android_external_jemalloc,tempbottle/jemalloc,sudosurootdev/external_jemalloc,dxq-git/jemalloc,ahmetmircik/jemalloc,ahmetmircik/jemalloc,Snaipe/jemalloc,flyfeifan/jemalloc,android-ia/platform_external_jemalloc,awreece/jemalloc,ahmetmircik/jemalloc,CyanogenMod/android_external_jemalloc,xin3liang/platform_external_jemalloc,garoose/jemalloc,AndroidExternal/jemalloc,vashstorm/jemalloc,wqfish/jemalloc,leebaok/jemalloc-4.2.1-readcode,cpeterso/jemalloc,vashstorm/jemalloc,AndroidExternal/jemalloc,glandium/jemalloc,AndroidExternal/jemalloc,android-ia/platform_external_jemalloc,awreece/jemalloc,jemalloc/jemalloc-cmake,android-ia/platform_external_jemalloc,android-ia/platform_external_jemalloc,AndroidExternal/jemalloc,lvfeng1130/jemalloc,yy-nm/jemalloc,wfxiang08/jemalloc,cpeterso/jemalloc,lvfeng1130/jemalloc,lvfeng1130/jemalloc,leebaok/jemalloc-4.2.1-readcode,geekboxzone/lollipop_external_jemalloc,glandium/jemalloc,wfxiang08/jemalloc,wespelee/jemalloc,VRToxin/android_external_jemalloc,jemalloc/jemalloc-cmake