mmc: bcm2835: Deduplicate reset of driver data on remove

The BCM2835 MMC host driver sets the device's driver data pointer to
NULL on ->remove() even though the driver core subsequently does the
same in __device_release_driver(). Drop the duplicate assignment.

Tested-by: Stefan Wahren <[e-mail]>
Signed-off-by: Lukas Wunner <[e-mail]>
Cc: Frank Pavlic <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/bcm2835.c

···
 		dma_release_channel(host->dma_chan_rxtx);
 
 	mmc_free_host(mmc);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }