DMA-API: net: b43: replace dma_set_mask()+dma_set_coherent_mask() with new helper

Replace the following sequence:

	dma_set_mask(dev, mask);
	dma_set_coherent_mask(dev, mask);

with a call to the new helper dma_set_mask_and_coherent().
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/net/wireless/b43/dma.c

@@ -1065,12 +1065,9 @@ static int b43_dma_set_mask(struct b43_wldev *dev, u64 mask)
 	/* Try to set the DMA mask. If it fails, try falling back to a
 	 * lower mask, as we can always also support a lower one. */
 	while (1) {
-		err = dma_set_mask(dev->dev->dma_dev, mask);
-		if (!err) {
-			err = dma_set_coherent_mask(dev->dev->dma_dev, mask);
+		err = dma_set_mask_and_coherent(dev->dev->dma_dev, mask);
 		if (!err)
 			break;
-		}
 		if (mask == DMA_BIT_MASK(64)) {
 			mask = DMA_BIT_MASK(32);
 			fallback = true;