net: stmmac: Fix zero-division error when disabling tc cbs

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CVE-2024-49977 · Microsoft / collected KEV context

cve-program · CVE-2024-49977

• https://git.kernel.org/stable/c/e33fe25b1efe4f2e6a5858786dbc82ae4c44ed4c
• https://git.kernel.org/stable/c/b0da9504a528f05f97d926b4db74ff21917a33e9
• https://git.kernel.org/stable/c/5d43e1ad4567d67af2b42d3ab7c14152ffed25c6
• https://git.kernel.org/stable/c/03582f4752427f60817d896f1a827aff772bd31e
• https://git.kernel.org/stable/c/e297a2bf56d12fd7f91a0c209eb6ea84361f3368
• https://git.kernel.org/stable/c/837d9df9c0792902710149d1a5e0991520af0f93
• https://git.kernel.org/stable/c/675faf5a14c14a2be0b870db30a70764df81e2df

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