wifi: rndis_wlan: Replace fake flex-array with flexible-array member

Zero-length arrays as fake flexible arrays are deprecated and we are
moving towards adopting C99 flexible-array members instead.

Address the following warning found with GCC-13 and
-fstrict-flex-array=3 enabled:
drivers/net/wireless/rndis_wlan.c:2902:23: warning: array subscript 0 is outside array bounds of ‘struct ndis_80211_auth_request[0]’ [-Warray-bounds=]

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [1].

Link: https://github.com/KSPP/linux/issues/21
Link: https://github.com/KSPP/linux/issues/274
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/ZBtIbU77L9eXqa4j@work

drivers/net/wireless/legacy/rndis_wlan.c

@@ -209,7 +209,7 @@ struct ndis_80211_status_indication {
 	union {
 		__le32					media_stream_mode;
 		__le32					radio_status;
-		struct ndis_80211_auth_request		auth_request[0];
+		DECLARE_FLEX_ARRAY(struct ndis_80211_auth_request, auth_request);
 		struct ndis_80211_pmkid_cand_list	cand_list;
 	} u;
 } __packed;