b43: bus: abstract 80211 core info

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/dma.c

@@ -1085,7 +1085,7 @@ int b43_dma_init(struct b43_wldev *dev)
 		goto err_destroy_mcast;
 
 	/* No support for the TX status DMA ring. */
-	B43_WARN_ON(dev->sdev->id.revision < 5);
+	B43_WARN_ON(dev->dev->core_rev < 5);
 
 	b43dbg(dev->wl, "%u-bit DMA initialized\n",
 	       (unsigned int)type);