can: mcp251x: Call wrapper instead of regulator_disable()

There is no need to check for regulator presence in the ->suspend()
since a wrapper does it for us. Due to this we may unconditionally set
AFTER_SUSPEND_POWER flag.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/spi/mcp251x.c

@@ -1142,10 +1142,8 @@ static int __maybe_unused mcp251x_can_suspend(struct device *dev)
 		priv->after_suspend = AFTER_SUSPEND_DOWN;
 	}
 
-	if (!IS_ERR_OR_NULL(priv->power)) {
-		regulator_disable(priv->power);
-		priv->after_suspend |= AFTER_SUSPEND_POWER;
-	}
+	mcp251x_power_enable(priv->power, 0);
+	priv->after_suspend |= AFTER_SUSPEND_POWER;
 
 	return 0;
 }