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 v5.14.15 by commit 65ede7bd97138435c07de602efc8812c586a1d38, it was introduced in version v5.14.15 by commit 6d077c37c4643394b1bae9682da48164fc147ea8. For more details please see the references link.