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

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CVE-2024-43889 · Microsoft / collected KEV context

cve-program · CVE-2024-43889

• https://git.kernel.org/stable/c/ab8b397d5997d8c37610252528edc54bebf9f6d3
• https://git.kernel.org/stable/c/8f5ffd2af7274853ff91d6cd62541191d9fbd10d
• https://git.kernel.org/stable/c/a29cfcb848c31f22b4de6a531c3e1d68c9bfe09f
• https://git.kernel.org/stable/c/924f788c906dccaca30acab86c7124371e1d6f2c
• https://git.kernel.org/stable/c/da0ffe84fcc1627a7dff82c80b823b94236af905
• https://git.kernel.org/stable/c/6d45e1c948a8b7ed6ceddb14319af69424db730c

No related operational record is retained in the current change model.