ath5k: fix off-by-one in gpio checks

Sanity checks against AR5K_NUM_GPIO were all broken.  This doesn't
currently cause any problems since we only use the first four gpios.

Changes-licensed-under: ISC

Reported-by: Andreas Mohr <andi@lisas.de>
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath5k/gpio.c

@@ -83,7 +83,7 @@ void ath5k_hw_set_ledstate(struct ath5k_hw *ah, unsigned int state)
 int ath5k_hw_set_gpio_input(struct ath5k_hw *ah, u32 gpio)
 {
 	ATH5K_TRACE(ah->ah_sc);
-	if (gpio > AR5K_NUM_GPIO)
+	if (gpio >= AR5K_NUM_GPIO)
 		return -EINVAL;
 
 	ath5k_hw_reg_write(ah,
@@ -99,7 +99,7 @@ int ath5k_hw_set_gpio_input(struct ath5k_hw *ah, u32 gpio)
 int ath5k_hw_set_gpio_output(struct ath5k_hw *ah, u32 gpio)
 {
 	ATH5K_TRACE(ah->ah_sc);
-	if (gpio > AR5K_NUM_GPIO)
+	if (gpio >= AR5K_NUM_GPIO)
 		return -EINVAL;
 
 	ath5k_hw_reg_write(ah,
@@ -115,7 +115,7 @@ int ath5k_hw_set_gpio_output(struct ath5k_hw *ah, u32 gpio)
 u32 ath5k_hw_get_gpio(struct ath5k_hw *ah, u32 gpio)
 {
 	ATH5K_TRACE(ah->ah_sc);
-	if (gpio > AR5K_NUM_GPIO)
+	if (gpio >= AR5K_NUM_GPIO)
 		return 0xffffffff;
 
 	/* GPIO input magic */
@@ -131,7 +131,7 @@ int ath5k_hw_set_gpio(struct ath5k_hw *ah, u32 gpio, u32 val)
 	u32 data;
 	ATH5K_TRACE(ah->ah_sc);
 
-	if (gpio > AR5K_NUM_GPIO)
+	if (gpio >= AR5K_NUM_GPIO)
 		return -EINVAL;
 
 	/* GPIO output magic */
@@ -154,7 +154,7 @@ void ath5k_hw_set_gpio_intr(struct ath5k_hw *ah, unsigned int gpio,
 	u32 data;
 
 	ATH5K_TRACE(ah->ah_sc);
-	if (gpio > AR5K_NUM_GPIO)
+	if (gpio >= AR5K_NUM_GPIO)
 		return;
 
 	/*