cfg80211: fix MFP bug, sparse warnings

sparse warns about a number of things, and one of them
(use_mfp shadowed variable) actually is a bug, fix all
of them.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/nl80211.c

@@ -3239,11 +3239,11 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info)
 	}
 
 	if (info->attrs[NL80211_ATTR_USE_MFP]) {
-		enum nl80211_mfp use_mfp =
+		enum nl80211_mfp mfp =
 			nla_get_u32(info->attrs[NL80211_ATTR_USE_MFP]);
-		if (use_mfp == NL80211_MFP_REQUIRED)
+		if (mfp == NL80211_MFP_REQUIRED)
 			use_mfp = true;
-		else if (use_mfp != NL80211_MFP_NO) {
+		else if (mfp != NL80211_MFP_NO) {
 			err = -EINVAL;
 			goto out;
 		}

net/wireless/wext-compat.c

@@ -855,7 +855,7 @@ static int cfg80211_set_wpa_version(struct wireless_dev *wdev, u32 wpa_versions)
 	return 0;
 }
 
-int cfg80211_set_cipher_group(struct wireless_dev *wdev, u32 cipher)
+static int cfg80211_set_cipher_group(struct wireless_dev *wdev, u32 cipher)
 {
 	wdev->wext.connect.crypto.cipher_group = 0;
 
@@ -880,7 +880,7 @@ int cfg80211_set_cipher_group(struct wireless_dev *wdev, u32 cipher)
 	return 0;
 }
 
-int cfg80211_set_cipher_pairwise(struct wireless_dev *wdev, u32 cipher)
+static int cfg80211_set_cipher_pairwise(struct wireless_dev *wdev, u32 cipher)
 {
 	int nr_ciphers = 0;
 	u32 *ciphers_pairwise = wdev->wext.connect.crypto.ciphers_pairwise;
@@ -918,7 +918,7 @@ int cfg80211_set_cipher_pairwise(struct wireless_dev *wdev, u32 cipher)
 }
 
 
-int cfg80211_set_key_mgt(struct wireless_dev *wdev, u32 key_mgt)
+static int cfg80211_set_key_mgt(struct wireless_dev *wdev, u32 key_mgt)
 {
 	int nr_akm_suites = 0;