ath9k: fix selecting the second antenna on a single-stream device with diversity

SVN-Revision: 32685

package/mac80211/patches/561-ath9k_antenna_mask_validate.patch

@@ -6,7 +6,7 @@
  
 +static bool validate_antenna_mask(struct ath_hw *ah, u32 val)
 +{
-+	switch (val & ah->caps.rx_chainmask) {
++	switch (val & 0x7) {
 +	case 0x1:
 +	case 0x3:
 +	case 0x7: