net/mdiobus: Fix potential out-of-bounds clause 45 read/write access

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{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/phy/mdio_bus.c"
                    ],
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                            "version": "6.12.34",
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