clk: microchip: fix potential UAF in auxdev release callback

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: clk: microchip: fix potential UAF in auxdev release callback Similar to commit 1c11289b34ab ("peci: cpu: Fix use-after-free in adev_release()"), the auxiliary device is not torn down in the correct order. If auxiliary_device_add() fails, the release callback will be called twice, resulting in a UAF. Due to timing, the auxdev code in this driver "took inspiration" from the aforementioned commit, and thus its bugs too! Moving auxiliary_device_uninit() to the unregister callback instead avoids the issue.

References

• https://git.kernel.org/stable/c/5b4052aa956e11bcd19e50ca559eb38dcb46201b
• https://git.kernel.org/stable/c/d7d6dacf39ed102d7667721ca1700022c9c8b11a
• https://git.kernel.org/stable/c/934406b2d42eaf3fc57f5546cc68ff7ab9680bb3
• https://git.kernel.org/stable/c/7455b7007b9e93bcc2bc9c1c6c73a228e3152069