mmc: remove unnecessary set_drvdata() function

The driver data will be cleared in device_unbind_cleanup() in driver
core code. So the set_drvdata(..., NULL) called in remove and error
path in probe can be removed.

Signed-off-by: Yang Yingliang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/core/block.c

···
 		pm_runtime_disable(&card->dev);
 	pm_runtime_put_noidle(&card->dev);
 	mmc_blk_remove_req(md);
-	dev_set_drvdata(&card->dev, NULL);
 	destroy_workqueue(card->complete_wq);
 }
 

drivers/mmc/host/moxart-mmc.c

···
 	struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
 	struct moxart_host *host = mmc_priv(mmc);
 
-	dev_set_drvdata(&pdev->dev, NULL);
-
 	if (!IS_ERR_OR_NULL(host->dma_chan_tx))
 		dma_release_channel(host->dma_chan_tx);
 	if (!IS_ERR_OR_NULL(host->dma_chan_rx))

drivers/mmc/host/sunplus-mmc.c

···
 	clk_disable_unprepare(host->clk);
 	pm_runtime_put_noidle(&dev->dev);
 	pm_runtime_disable(&dev->dev);
-	platform_set_drvdata(dev, NULL);
 
 	return 0;
 }

drivers/mmc/host/via-sdmmc.c

···
 unmap:
 	iounmap(sdhost->mmiobase);
 free_mmc_host:
-	dev_set_drvdata(&pcidev->dev, NULL);
 	mmc_free_host(mmc);
 release:
 	pci_release_regions(pcidev);
···
 	writeb(gatt, sdhost->pcictrl_mmiobase + VIA_CRDR_PCICLKGATT);
 
 	iounmap(sdhost->mmiobase);
-	dev_set_drvdata(&pcidev->dev, NULL);
 	mmc_free_host(sdhost->mmc);
 	pci_release_regions(pcidev);
 	pci_disable_device(pcidev);

drivers/mmc/host/wbsd.c

···
 	del_timer_sync(&host->ignore_timer);
 
 	mmc_free_host(mmc);
-
-	dev_set_drvdata(dev, NULL);
 }
 
 /*