idpf: fix double free and use-after-free in aux device error paths

In the Linux kernel, the following vulnerability has been resolved:

idpf: fix double free and use-after-free in aux device error paths

When auxiliary_device_add() fails in idpf_plug_vport_aux_dev() or

idpf_plug_core_aux_dev(), the err_aux_dev_add label calls

auxiliary_device_uninit() and falls through to err_aux_dev_init. The

uninit call will trigger put_device(), which invokes the release

callback (idpf_vport_adev_release / idpf_core_adev_release) that frees

iadev. The fall-through then reads adev->id from the freed iadev for

ida_free() and double-frees iadev with kfree().

Free the IDA slot and clear the back-pointer before uninit, while adev

is still valid, then return immediately.

Commit 65637c3a1811 ("idpf: fix UAF in RDMA core aux dev deinitialization")

fixed the same use-after-free in the matching unplug path in this file but

missed both probe error paths.