mfd: tc6387xb: 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: Lee Jones <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

drivers/mfd/tc6387xb.c

···
 	release_resource(&tc6387xb->rscr);
 	clk_disable(tc6387xb->clk32k);
 	clk_put(tc6387xb->clk32k);
-	platform_set_drvdata(dev, NULL);
 	kfree(tc6387xb);
 
 	return 0;