[PATCH][next] wifi: mt76: mt7996: Use DECLARE_FLEX_ARRAY() and fix -Warray-bounds warnings

[Gustavo A. R. Silva]

Transform zero-length arrays `adm_stat` and `msdu_cnt` into proper
flexible-array members in anonymous union in `struct
mt7996_mcu_all_sta_info_event` via the DECLARE_FLEX_ARRAY()
helper; and fix multiple -Warray-bounds warnings:

drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:483:61: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:490:58: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:492:58: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:469:61: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:477:66: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:479:66: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]

This results in no differences in binary output, helps with the ongoing
efforts to globally enable -Warray-bounds.

Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
 drivers/net/wireless/mediatek/mt76/mt7996/mcu.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h
index a88f6af323da..9f516f796d63 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h
@@ -163,19 +163,19 @@ struct mt7996_mcu_all_sta_info_event {
 	u8 rsv3[2];
 
 	union {
-		struct {
+		DECLARE_FLEX_ARRAY(struct {
 			__le16 wlan_idx;
 			u8 rsv[2];
 			__le32 tx_bytes[IEEE80211_NUM_ACS];
 			__le32 rx_bytes[IEEE80211_NUM_ACS];
-		} adm_stat[0];
+		}, adm_stat);
 
-		struct {
+		DECLARE_FLEX_ARRAY(struct {
 			__le16 wlan_idx;
 			u8 rsv[2];
 			__le32 tx_msdu_cnt;
 			__le32 rx_msdu_cnt;
-		} msdu_cnt[0];
+		}, msdu_cnt);
 	};
 } __packed;
 
-- 
2.34.1