b43: fix split of N-PHY devices into supported and not (based on PHY rev)

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 670fd7b..4d97aac 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -4054,7 +4054,7 @@
 		break;
 #ifdef CONFIG_B43_NPHY
 	case B43_PHYTYPE_N:
-		if (phy_rev > 4)
+		if (phy_rev > 2)
 			unsupported = 1;
 		break;
 #endif