CVE-2024-43889 padata: Fix possible divide-by-0 panic in padata_mt_helper()

In the Linux kernel, the following vulnerability has been resolved: padata: Fix possible divide-by-0 panic in padatamthelper We are hit with a not easily reproducible divide-by-0 panic in padata.c at bootup time. 10.017908 Oops: divide error: 0000 1 PREEMPT SMP NOPTI 10.017908 CPU: 26 PID: 2627...