s390/qeth: fix NULL deref in qethclearworkingpoollist()
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 v5.10.70 by commit db94f89e1dadf693c15c2d60de0c34777cea5779, it was introduced in version v5.9 by commit eff73e16ee116f6eafa2be48fab42659a27cb453. For more details please see the references link.