net: irda: 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]>
Acked-by: Kuninori Morimoto <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/irda/bfin_sir.c

···
 	kfree(self->rx_buff.head);
 	free_netdev(dev);
 	kfree(sir_port);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }

drivers/net/irda/sh_irda.c

···
 	sh_irda_remove_iobuf(self);
 	iounmap(self->membase);
 	free_netdev(ndev);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }

drivers/net/irda/sh_sir.c

···
 	sh_sir_remove_iobuf(self);
 	iounmap(self->membase);
 	free_netdev(ndev);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }