regulator: rt5133: Fix IS_ERR() vs NULL bug in rt5133_validate_vendor_info()

The "priv->cdata" pointer isn't an error pointer; this should be a NULL
check instead. Otherwise it leads to a NULL pointer dereference in the
caller, rt5133_probe().

Fixes: 714165e1c4b0 ("regulator: rt5133: Add RT5133 PMIC regulator Support")
Signed-off-by: Dan Carpenter <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/rt5133-regulator.c

···
 			break;
 		}
 	}
-	if (IS_ERR(priv->cdata)) {
+	if (!priv->cdata) {
 		dev_err(priv->dev, "Failed to find regulator match version\n");
 		return -ENODEV;
 	}