mmc: bcm2835: Use devm_mmc_alloc_host() helper

Use new function devm_mmc_alloc_host() to simplify the code.

Cc: Florian Fainelli <[e-mail]>
Cc: Ray Jui <[e-mail]>
Cc: Scott Branden <[e-mail]>
Reviewed-by: Huacai Chen <[e-mail]>
Signed-off-by: Binbin Zhou <[e-mail]>
Link: https://lore.kernel.org/r/37[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/bcm2835.c

···
 	int ret;
 
 	dev_dbg(dev, "%s\n", __func__);
-	mmc = mmc_alloc_host(sizeof(*host), dev);
+	mmc = devm_mmc_alloc_host(dev, sizeof(*host));
 	if (!mmc)
 		return -ENOMEM;
 
···
 	dev_dbg(dev, "%s -> err %d\n", __func__, ret);
 	if (host->dma_chan_rxtx)
 		dma_release_channel(host->dma_chan_rxtx);
-	mmc_free_host(mmc);
 
 	return ret;
 }
···
 
 	if (host->dma_chan_rxtx)
 		dma_release_channel(host->dma_chan_rxtx);
-
-	mmc_free_host(mmc);
 }
 
 static const struct of_device_id bcm2835_match[] = {