CVE-2021-47382 s390/qeth: fix deadlock during failing recovery

In the Linux kernel, the following vulnerability has been resolved: s390/qeth: fix deadlock during failing recovery Commit 0b9902c1fcc5 "s390/qeth: fix deadlock during recovery" removed taking disciplinemutex inside qethdoreset, fixing potential deadlocks. An error path was missed though, that...