kernel: sysctl: always initialize i_uid/i_gid

In the Linux kernel, the following vulnerability has been resolved: sysctl: always initialize iuid/igid Always initialize iuid/igid inside the sysfs core so setownership can safely skip setting them. Commit 5ec27ec735ba "fs/proc/procsysctl.c: fix the default values of iuid/igid on /proc/sys...