sony-laptop: fix early NULL pointer dereference
The SNC acpi driver could get early notifications before it fully initializes and that could lead to dereferencing the sony_nc_handles structure pointer that is still NULL at that stage. Make sure we return early from the handle lookup function in these cases. Signed-off-by: Mattia Dongili <malattia@linux.it> Signed-off-by: Matthew Garrett <mjg@redhat.com>
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