mtd: Few follow up cleanups for Smartmedia/xD support

* Test results of few functions that were declared with __must_check
* Fix bogus gcc warning about uinitialized variable 'ret'
* Remove unused variable from mtdblock_remove_dev
* Don't use deprecated DMA_32BIT_MASK

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/nand/r852.c b/drivers/mtd/nand/r852.c
index 9307a88..7a616a9 100644
--- a/drivers/mtd/nand/r852.c
+++ b/drivers/mtd/nand/r852.c
@@ -654,7 +654,9 @@
 	if (sm_register_device(dev->mtd))
 		goto error2;
 
-	device_create_file(&dev->mtd->dev, &dev_attr_media_type);
+	if (device_create_file(&dev->mtd->dev, &dev_attr_media_type))
+		message("can't create media type sysfs attribute");
+
 	dev->card_registred = 1;
 	return 0;
 error2:
@@ -838,7 +840,7 @@
 
 	pci_set_master(pci_dev);
 
-	error = pci_set_dma_mask(pci_dev, DMA_32BIT_MASK);
+	error = pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32));
 	if (error)
 		goto error2;