can: flexcan: flexcan_remove(): add missing netif_napi_del()

This patch adds the missing netif_napi_del() to the flexcan_remove() function.

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

(cherry picked from commit d96e43e8)
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

drivers/net/can/flexcan.c

@@ -1139,6 +1139,7 @@ static int flexcan_remove(struct platform_device *pdev)
 	struct resource *mem;
 
 	unregister_flexcandev(dev);
+	netif_napi_del(&priv->napi);
 	platform_set_drvdata(pdev, NULL);
 	iounmap(priv->base);