iwlwifi: make index unsigned int for iwl_send_led_cmd

This is a small fix to change the idx type from int to unsigned.

Signed-off-by: Abhijeet Kolekar <abhijeet.kolekar@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-led.h b/drivers/net/wireless/iwlwifi/iwl-3945-led.h
index 6463e6e..47b7e0b 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945-led.h
+++ b/drivers/net/wireless/iwlwifi/iwl-3945-led.h
@@ -54,7 +54,7 @@
 	int (*led_on) (struct iwl3945_priv *priv, int led_id);
 	int (*led_off) (struct iwl3945_priv *priv, int led_id);
 	int (*led_pattern) (struct iwl3945_priv *priv, int led_id,
-			    int idx);
+			    unsigned int idx);
 
 	enum led_type type;
 	unsigned int registered;