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 v5.4.225 by commit c5c0b3167537793a7cf936fb240366eefd2fc7fb, it was introduced in version v4.15 by commit 7db91e57a0acde126a162ababfb1e0ab190130cb. For more details please see the references link.