platform/x86: toshiba_haps: 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 toshiba_haps driver.

Fixes: 3a96c79 ("platform/x86: toshiba_haps: 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/2285136.Mh6RI2rZIc@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/toshiba_haps.c

@@ -182,13 +182,17 @@ static int toshiba_haps_available(acpi_handle handle)
 
 static int toshiba_haps_probe(struct platform_device *pdev)
 {
-	struct acpi_device *acpi_dev = ACPI_COMPANION(&pdev->dev);
 	struct toshiba_haps_dev *haps;
+	struct acpi_device *acpi_dev;
 	int ret;
 
 	if (toshiba_haps)
 		return -EBUSY;
 
+	acpi_dev = ACPI_COMPANION(&pdev->dev);
+	if (!acpi_dev)
+		return -ENODEV;
+
 	if (!toshiba_haps_available(acpi_dev->handle))
 		return -ENODEV;