Staging: atomisp: kfreeing a devm allocated pointer

We shouldn't pass devm allocated pointers to kfree() or it leads to a
double free.

Fixes: a49d2536 ("staging/atomisp: Add support for the Intel IPU v2")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>