ACPI: PMIC: Remove unneeded check in tps68470_pmic_opregion_probe()

In tps68470_pmic_opregion_probe() pointer 'dev' is compared to NULL which
is useless.

Fix this issue by removing unneeded check.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: e13452a ("ACPI / PMIC: Add TI PMIC TPS68470 operation region driver")
Suggested-by: Andy Shevchenko <[email protected]>
Signed-off-by: Aleksandr Mishin <[email protected]>
Reviewed-by: Sakari Ailus <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Link: https://patch.msgid.link/[email protected]
[ rjw: Subject edit ]
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: Aleksandr Mishin

drivers/acpi/pmic/tps68470_pmic.c

@@ -376,10 +376,8 @@ static int tps68470_pmic_opregion_probe(struct platform_device *pdev)
 	struct tps68470_pmic_opregion *opregion;
 	acpi_status status;
 
-	if (!dev || !tps68470_regmap) {
-		dev_warn(dev, "dev or regmap is NULL\n");
-		return -EINVAL;
-	}
+	if (!tps68470_regmap)
+		return dev_err_probe(dev, -EINVAL, "regmap is missing\n");
 
 	if (!handle) {
 		dev_warn(dev, "acpi handle is NULL\n");