Blackfin SPI Driver: drop bogus cast and touchup dma label

Blackfin's related DMA callback API doesn't need void * cast, so drop it.
And this driver is for all Blackfin processors not only for BF53x, we
update the DMA request label for more meaningful information.

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/spi/spi_bfin5xx.c

@@ -1077,13 +1077,13 @@ static int setup(struct spi_device *spi)
 	 */
 	if (chip->enable_dma && !drv_data->dma_requested) {
 		/* register dma irq handler */
-		if (request_dma(drv_data->dma_channel, "BF53x_SPI_DMA") < 0) {
+		if (request_dma(drv_data->dma_channel, "BFIN_SPI_DMA") < 0) {
 			dev_dbg(&spi->dev,
 				"Unable to request BlackFin SPI DMA channel\n");
 			return -ENODEV;
 		}
 		if (set_dma_callback(drv_data->dma_channel,
-			(void *)dma_irq_handler, drv_data) < 0) {
+		    dma_irq_handler, drv_data) < 0) {
 			dev_dbg(&spi->dev, "Unable to set dma callback\n");
 			return -EPERM;
 		}