platform/x86: sony-laptop: Check ACPI_COMPANION() against NULL

platform/x86: sony-laptop: Check ACPI_COMPANION() against NULL

Every platform driver can be forced to match a device that doesn't match
its list of device IDs because of device_match_driver_override(), so
platform drivers that rely on the existence of a device's ACPI companion
object need to verify its presence.

Accordingly, add requisite ACPI_COMPANION() checks against NULL to the
platform/x86 sony-laptop driver.

Fixes: 138db7ee58c0 ("platform/x86: sony-laptop: Convert PIC driver to a platform one")
Fixes: 14004dd31caa ("platform/x86: sony-laptop: Convert NC driver to a platform one")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/1871155.VLH7GnMWUR@rafael.j.wysocki
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>