ath9k: Fix typo in checking for chip revision

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/hw.c

@@ -267,7 +267,7 @@ static int ath9k_hw_get_radiorev(struct ath_hal *ah)
 
 static void ath9k_hw_disablepcie(struct ath_hal *ah)
 {
-	if (!AR_SREV_9100(ah))
+	if (AR_SREV_9100(ah))
 		return;
 
 	REG_WRITE(ah, AR_PCIE_SERDES, 0x9248fc00);