Remove struct ieee80211_mgmt::u.probe_req

This struct in the union is empty, but the design of using a zero-length
u8 array here is not fully compatible with C++ and can result in
undesired compiler warnings. This struct is not used anymore, so it can
be removed from the struct ieee80211_mgmt definition to complete the
changes started in commit d447cd596f0a9f73850229e7fa2bdd35755dc750
('Updates for stricter automatic memcpy bounds checking').

Signed-off-by: Jouni Malinen <j@w1.fi>

src/common/ieee802_11_defs.h

@@ -527,10 +527,7 @@ struct ieee80211_mgmt {
 			 * FH Params, DS Params, CF Params, IBSS Params, TIM */
 			u8 variable[];
 		} STRUCT_PACKED beacon;
-		struct {
-			/* only variable items: SSID, Supported rates */
-			u8 variable[0];
-		} STRUCT_PACKED probe_req;
+		/* probe_req: only variable items: SSID, Supported rates */
 		struct {
 			u8 timestamp[8];
 			le16 beacon_int;