Remove unused variable in arena_run_split().
Remove unused variable in arena_run_split().

Submitted by Mike Hommey.

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