mac80211: warn only once in check_sdata_in_driver() at each caller

Ben Greear has repeatedly reported in the past (for a few years
probably) that this triggers repeatedly in certain scenarios.

Make this a macro so that each callsite can trigger the warning
only once - that will still give us an idea of what's going on
and what paths can reach it, but avoids being too noisy.

Link: https://lore.kernel.org/r/20200730155212.06fd3a95dbfb.I0b16829aabfaf5f642bce401502a29d16e2dd444@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/driver-ops.h

@@ -12,12 +12,11 @@
 #include "ieee80211_i.h"
 #include "trace.h"
 
-static inline bool check_sdata_in_driver(struct ieee80211_sub_if_data *sdata)
-{
-	return !WARN(!(sdata->flags & IEEE80211_SDATA_IN_DRIVER),
-		     "%s:  Failed check-sdata-in-driver check, flags: 0x%x\n",
-		     sdata->dev ? sdata->dev->name : sdata->name, sdata->flags);
-}
+#define check_sdata_in_driver(sdata)	({					\
+	!WARN_ONCE(!(sdata->flags & IEEE80211_SDATA_IN_DRIVER),			\
+		   "%s: Failed check-sdata-in-driver check, flags: 0x%x\n",	\
+		   sdata->dev ? sdata->dev->name : sdata->name, sdata->flags);	\
+})
 
 static inline struct ieee80211_sub_if_data *
 get_bss_sdata(struct ieee80211_sub_if_data *sdata)