Use DECLARE_FLEX_ARRAY() helper in drivers/net/wireless/ath/wil6210/fw.h

[GustavoARSilva]

diff -u -p a/drivers/net/wireless/ath/wil6210/fw.h b/drivers/net/wireless/ath/wil6210/fw.h
--- a/drivers/net/wireless/ath/wil6210/fw.h
+++ b/drivers/net/wireless/ath/wil6210/fw.h
@@ -131,7 +131,7 @@ struct wil_fw_data_dwrite {
  * data_size is @head.size where @head is record header
  */
 struct wil_fw_record_direct_write { /* type == wil_fw_type_direct_write */
-       struct wil_fw_data_dwrite data[0];
+       struct wil_fw_data_dwrite data[];
 } __packed;

 /* verify condition: [@addr] & @mask == @value