b43: don't warn about no 5 GHz support on 2.4 GHz devices

This could be a bit confusing to see warning about lacking support for
5 GHz band if your device supports 2.4 GHz only.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/main.c

@@ -5268,6 +5268,7 @@ static int b43_wireless_core_attach(struct b43_wldev *dev)
 	b43_supported_bands(dev, &have_2ghz_phy, &have_5ghz_phy);
 
 	/* We don't support 5 GHz on some PHYs yet */
+	if (have_5ghz_phy) {
 		switch (dev->phy.type) {
 		case B43_PHYTYPE_A:
 		case B43_PHYTYPE_G:
@@ -5277,6 +5278,7 @@ static int b43_wireless_core_attach(struct b43_wldev *dev)
 			b43warn(wl, "5 GHz band is unsupported on this PHY\n");
 			have_5ghz_phy = false;
 		}
+	}
 
 	if (!have_2ghz_phy && !have_5ghz_phy) {
 		b43err(wl, "b43 can't support any band on this device\n");