usb: phy: mv-usb: Remove redundant platform_set_drvdata()

Commit 0998d06310 (device-core: Ensure drvdata = NULL when no
driver is bound) removes the need to set driver data field to
NULL.

Signed-off-by: Sachin Kamat <[e-mail]>
Cc: Chao Xie <[e-mail]>
Signed-off-by: Felipe Balbi <[e-mail]>

drivers/usb/phy/phy-mv-usb.c

···
 	mv_otg_disable(mvotg);
 
 	usb_remove_phy(&mvotg->phy);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }
···
 err_destroy_workqueue:
 	flush_workqueue(mvotg->qwork);
 	destroy_workqueue(mvotg->qwork);
-
-	platform_set_drvdata(pdev, NULL);
 
 	return retval;
 }