mac80211: fix sparse warnings/errors

sparse complains about a shadowed variable, which
we can just rename, and lots of stuff if the API
tracer is enabled, so kick out the tracer code in
a sparse run -- the macros just confuse it.

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

net/mac80211/driver-trace.c

@@ -1,6 +1,9 @@
 /* bug in tracepoint.h, it should include this */
 #include <linux/module.h>
 
+/* sparse isn't too happy with all macros... */
+#ifndef __CHECKER__
 #include "driver-ops.h"
 #define CREATE_TRACE_POINTS
 #include "driver-trace.h"
+#endif

net/mac80211/iface.c

@@ -401,7 +401,7 @@ static int ieee80211_stop(struct net_device *dev)
 
 	/* APs need special treatment */
 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
-		struct ieee80211_sub_if_data *vlan, *tmp;
+		struct ieee80211_sub_if_data *vlan, *tmpsdata;
 		struct beacon_data *old_beacon = sdata->u.ap.beacon;
 
 		/* remove beacon */
@@ -410,7 +410,7 @@ static int ieee80211_stop(struct net_device *dev)
 		kfree(old_beacon);
 
 		/* down all dependent devices, that is VLANs */
-		list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
+		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 					 u.vlan.list)
 			dev_close(vlan->dev);
 		WARN_ON(!list_empty(&sdata->u.ap.vlans));