b43: use enum for firmware header format

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/xmit.h b/drivers/net/wireless/b43/xmit.h
index 79fc162..a3ff727 100644
--- a/drivers/net/wireless/b43/xmit.h
+++ b/drivers/net/wireless/b43/xmit.h
@@ -166,19 +166,16 @@
 #define  B43_TXH_PHY1_MODUL_QAM256	0x2000 /* QAM256 */
 
 
-/* r351 firmware compatibility stuff. */
-static inline
-bool b43_is_old_txhdr_format(struct b43_wldev *dev)
-{
-	return (dev->fw.rev <= 351);
-}
-
 static inline
 size_t b43_txhdr_size(struct b43_wldev *dev)
 {
-	if (b43_is_old_txhdr_format(dev))
+	switch (dev->fw.hdr_format) {
+	case B43_FW_HDR_410:
+		return 104 + sizeof(struct b43_plcp_hdr6);
+	case B43_FW_HDR_351:
 		return 100 + sizeof(struct b43_plcp_hdr6);
-	return 104 + sizeof(struct b43_plcp_hdr6);
+	}
+	return 0;
 }