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mt7915_thermal_init() registered the thermal cooling device and its sysfs
link, then returned the hwmon registration error without undoing them.
The cooling device (not devm-managed) and the link then leaked, and its
callbacks referenced the freed phy. Unregister the cooling device before
returning the error.
Fixes: 0ae3ff568451 ("mt76: mt7915: fix hwmon temp sensor mem use-after-free")
Signed-off-by: Felix Fietkau <[email protected]>