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: 138db7e ("platform/x86: sony-laptop: Convert PIC driver to a platform one")
Fixes: 14004dd ("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>

Author: rafaeljw

drivers/platform/x86/sony-laptop.c

@@ -3147,11 +3147,15 @@ static void sony_nc_backlight_cleanup(void)
 
 static int sony_nc_probe(struct platform_device *pdev)
 {
-	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
+	struct acpi_device *device;
 	acpi_status status;
 	int result = 0;
 	struct sony_nc_value *item;
 
+	device = ACPI_COMPANION(&pdev->dev);
+	if (!device)
+		return -ENODEV;
+
 	sony_nc_acpi_device = device;
 	strscpy(acpi_device_class(device), "sony/hotkey");
 
@@ -4509,11 +4513,15 @@ static void sony_pic_remove(struct platform_device *pdev)
 
 static int sony_pic_probe(struct platform_device *pdev)
 {
-	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
 	struct sony_pic_ioport *io, *tmp_io;
 	struct sony_pic_irq *irq, *tmp_irq;
+	struct acpi_device *device;
 	int result;
 
+	device = ACPI_COMPANION(&pdev->dev);
+	if (!device)
+		return -ENODEV;
+
 	spic_dev.acpi_dev = device;
 	strscpy(acpi_device_class(device), "sony/hotkey");
 	sony_pic_detect_device_type(&spic_dev);