powerpc/idle: Don't corrupt back chain when going idle
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 v5.15 by commit 496c5fe25c377ddb7815c4ce8ecfb676f051e9b6, it was introduced in version v5.15 by commit 9b4416c5095c20e110c82ae602c254099b83b72f. For more details please see the references link.