(minor) chown: Fix build for -O2
(minor) chown: Fix build for -O2

group_id could be used without initialization

Kakadu/embox,embox/embox,embox/embox,Kakadu/embox,embox/embox,embox/embox,Kakadu/embox,Kakadu/embox,Kakadu/embox,embox/embox,Kakadu/embox,Kakadu/embox,embox/embox