iio: core: Prevent invalid memory access when there is no parent

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

iio: core: Prevent invalid memory access when there is no parent

Commit 813665564b3d ("iio: core: Convert to use firmware node handle

instead of OF node") switched the kind of nodes to use for label

retrieval in device registration. Probably an unwanted change in that

commit was that if the device has no parent then NULL pointer is

accessed. This is what happens in the stock IIO dummy driver when a

new entry is created in configfs:

# mkdir /sys/kernel/config/iio/devices/dummy/foo

BUG: kernel NULL pointer dereference, address: ...

...

Call Trace:

__iio_device_register

iio_dummy_probe

Since there seems to be no reason to make a parent device of an IIO

dummy device mandatory, let’s prevent the invalid memory access in

__iio_device_register when the parent device is NULL. With this

change, the IIO dummy driver works fine with configfs.