can: m_can: m_can_plat_remove(): remove unneeded platform_set_drvdata()

There's no need to unset the drvdata on remove, so remove the unneeded call to
platform_set_drvdata() in m_can_plat_remove().

Link: https://lore.kernel.org/r/20201130133713.269256-6-mkl@pengutronix.deReviewed-by: NDan Murphy <dmurphy@ti.com>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/m_can/m_can_platform.c

@@ -141,8 +141,6 @@ static int m_can_plat_remove(struct platform_device *pdev)
 
 	m_can_class_free_dev(mcan_class->net);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return 0;
 }