cfg80211: tracing: avoid 'idx' variable

This variable shadows something that gets generated inside
the tracing macros, which causes sparse to warn. Avoid it
so sparse output is more readable, even if it doesn't seem
to cause any trouble.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/trace.h

@@ -770,9 +770,9 @@ DEFINE_EVENT(wiphy_netdev_mac_evt, rdev_set_wds_peer,
 );
 
 TRACE_EVENT(rdev_dump_station,
-	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, int idx,
+	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, int _idx,
 		 u8 *mac),
-	TP_ARGS(wiphy, netdev, idx, mac),
+	TP_ARGS(wiphy, netdev, _idx, mac),
 	TP_STRUCT__entry(
 		WIPHY_ENTRY
 		NETDEV_ENTRY
@@ -783,7 +783,7 @@ TRACE_EVENT(rdev_dump_station,
 		WIPHY_ASSIGN;
 		NETDEV_ASSIGN;
 		MAC_ASSIGN(sta_mac, mac);
-		__entry->idx = idx;
+		__entry->idx = _idx;
 	),
 	TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", station mac: " MAC_PR_FMT ", idx: %d",
 		  WIPHY_PR_ARG, NETDEV_PR_ARG, MAC_PR_ARG(sta_mac),
@@ -847,9 +847,9 @@ DEFINE_EVENT(mpath_evt, rdev_get_mpath,
 );
 
 TRACE_EVENT(rdev_dump_mpath,
-	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, int idx,
+	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, int _idx,
 		 u8 *dst, u8 *next_hop),
-	TP_ARGS(wiphy, netdev, idx, dst, next_hop),
+	TP_ARGS(wiphy, netdev, _idx, dst, next_hop),
 	TP_STRUCT__entry(
 		WIPHY_ENTRY
 		NETDEV_ENTRY
@@ -862,7 +862,7 @@ TRACE_EVENT(rdev_dump_mpath,
 		NETDEV_ASSIGN;
 		MAC_ASSIGN(dst, dst);
 		MAC_ASSIGN(next_hop, next_hop);
-		__entry->idx = idx;
+		__entry->idx = _idx;
 	),
 	TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", index: %d, destination: "
 		  MAC_PR_FMT ", next hop: " MAC_PR_FMT,
@@ -892,9 +892,9 @@ TRACE_EVENT(rdev_get_mpp,
 );
 
 TRACE_EVENT(rdev_dump_mpp,
-	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, int idx,
+	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, int _idx,
 		 u8 *dst, u8 *mpp),
-	TP_ARGS(wiphy, netdev, idx, mpp, dst),
+	TP_ARGS(wiphy, netdev, _idx, mpp, dst),
 	TP_STRUCT__entry(
 		WIPHY_ENTRY
 		NETDEV_ENTRY
@@ -907,7 +907,7 @@ TRACE_EVENT(rdev_dump_mpp,
 		NETDEV_ASSIGN;
 		MAC_ASSIGN(dst, dst);
 		MAC_ASSIGN(mpp, mpp);
-		__entry->idx = idx;
+		__entry->idx = _idx;
 	),
 	TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", index: %d, destination: "
 		  MAC_PR_FMT ", mpp: " MAC_PR_FMT,
@@ -1673,8 +1673,8 @@ TRACE_EVENT(rdev_tdls_mgmt,
 );
 
 TRACE_EVENT(rdev_dump_survey,
-	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, int idx),
-	TP_ARGS(wiphy, netdev, idx),
+	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, int _idx),
+	TP_ARGS(wiphy, netdev, _idx),
 	TP_STRUCT__entry(
 		WIPHY_ENTRY
 		NETDEV_ENTRY
@@ -1683,7 +1683,7 @@ TRACE_EVENT(rdev_dump_survey,
 	TP_fast_assign(
 		WIPHY_ASSIGN;
 		NETDEV_ASSIGN;
-		__entry->idx = idx;
+		__entry->idx = _idx;
 	),
 	TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", index: %d",
 		  WIPHY_PR_ARG, NETDEV_PR_ARG, __entry->idx)