iwlwifi: fix sparse warning about wrong enum for band parameter

drivers/net/wireless/iwlwifi/iwl-scan.c:386:27: warning: mixing different enum types
drivers/net/wireless/iwlwifi/iwl-scan.c:386:27:     int enum nl80211_band  versus
drivers/net/wireless/iwlwifi/iwl-scan.c:386:27:     int enum ieee80211_band
drivers/net/wireless/iwlwifi/iwl-scan.c:435:57: warning: mixing different enum types
drivers/net/wireless/iwlwifi/iwl-scan.c:435:57:     int enum ieee80211_band  versus
drivers/net/wireless/iwlwifi/iwl-scan.c:435:57:     int enum nl80211_band
drivers/net/wireless/iwlwifi/iwl-scan.c:474:53: warning: mixing different enum types
drivers/net/wireless/iwlwifi/iwl-scan.c:474:53:     int enum ieee80211_band  versus
drivers/net/wireless/iwlwifi/iwl-scan.c:474:53:     int enum nl80211_band
drivers/net/wireless/iwlwifi/iwl-scan.c:588:72: warning: mixing different enum types
drivers/net/wireless/iwlwifi/iwl-scan.c:588:72:     int enum ieee80211_band  versus
drivers/net/wireless/iwlwifi/iwl-scan.c:588:72:     int enum nl80211_band
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-scan.c

@@ -350,7 +350,7 @@ EXPORT_SYMBOL(iwl_init_scan_params);
 static int __must_check iwl_scan_initiate(struct iwl_priv *priv,
 					  struct ieee80211_vif *vif,
 					  bool internal,
-					  enum nl80211_band band)
+					  enum ieee80211_band band)
 {
 	int ret;