platform/x86: eeepc-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 a requisite ACPI_COMPANION() check against NULL to the
platform/x86 eeepc-laptop driver.

Fixes: 079b59f ("platform/x86: eeepc-laptop: Convert ACPI 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/3056852.e9J7NaK4W3@rafael.j.wysocki
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: rafaeljw

drivers/platform/x86/eeepc-laptop.c

@@ -1363,10 +1363,14 @@ static bool eeepc_device_present;
 
 static int eeepc_acpi_probe(struct platform_device *pdev)
 {
-	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
+	struct acpi_device *device;
 	struct eeepc_laptop *eeepc;
 	int result;
 
+	device = ACPI_COMPANION(&pdev->dev);
+	if (!device)
+		return -ENODEV;
+
 	pr_notice(EEEPC_LAPTOP_NAME "\n");
 	eeepc = kzalloc_obj(struct eeepc_laptop);
 	if (!eeepc)