riscv: process: fix kernel info leakage
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.19.267 by commit c4601d30f7d989b4f354df899ab85b5f7a750d30, it was introduced in version v4.15 by commit 7db91e57a0acde126a162ababfb1e0ab190130cb. For more details please see the references link.