b43: use switches for SSB specific code

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/bus.h b/drivers/net/wireless/b43/bus.h
index a70b7b9..f3c30eb 100644
--- a/drivers/net/wireless/b43/bus.h
+++ b/drivers/net/wireless/b43/bus.h
@@ -2,7 +2,9 @@
 #define B43_BUS_H_
 
 enum b43_bus_type {
+#ifdef CONFIG_B43_BCMA
 	B43_BUS_BCMA,
+#endif
 	B43_BUS_SSB,
 };