wifi: mac80211: remove unused MAX_MSG_LEN define

This got unused when the tracing was converted to dynamic
strings, so the define can be removed.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/trace_msg.h

@@ -16,8 +16,6 @@
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM mac80211_msg
 
-#define MAX_MSG_LEN	120
-
 DECLARE_EVENT_CLASS(mac80211_msg_event,
 	TP_PROTO(struct va_format *vaf),