ubi: Fix possible null-ptr-deref in ubi_free_volume()

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

ubi: Fix possible null-ptr-deref in ubi_free_volume()

It willl cause null-ptr-deref in the following case:

uif_init()

ubi_add_volume()

cdev_add() -> if it fails, call kill_volumes()

device_register()

kill_volumes() -> if ubi_add_volume() fails call this function

ubi_free_volume()

cdev_del()

device_unregister() -> trying to delete a not added device,

it causes null-ptr-deref

So in ubi_free_volume(), it delete devices whether they are added

or not, it will causes null-ptr-deref.

Handle the error case whlie calling ubi_add_volume() to fix this

problem. If add volume fails, set the corresponding vol to null,

so it can not be accessed in kill_volumes() and release the

resource in ubi_add_volume() error path.