net: can: flexcan: remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release
or on probe failure, since commit 0998d0631001288a5974afc0b2a5f568bcdecb4d
(device-core: Ensure drvdata = NULL when no driver is bound).
Thus, it is not needed to manually clear the device driver data to NULL.

Signed-off-by: Jingoo Han <[e-mail]>
Signed-off-by: Marc Kleine-Budde <[e-mail]>

drivers/net/can/flexcan.c

···
 	struct resource *mem;
 
 	unregister_flexcandev(dev);
-	platform_set_drvdata(pdev, NULL);
 	iounmap(priv->base);
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);