ath6kl: wmi: Replace one-element array with flexible-array member in struct wmi_connect_event

Replace one-element array with flexible-array member in struct
wmi_connect_event.

This issue was found with the help of Coccinelle and audited and fixed,
manually.

Link: https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/79Reviewed-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/290a0cb7bddd813a6a96a59853880e66917aa03d.1645736204.git.gustavoars@kernel.org

drivers/net/wireless/ath/ath6kl/wmi.h

@@ -1545,7 +1545,7 @@ struct wmi_connect_event {
 	u8 beacon_ie_len;
 	u8 assoc_req_len;
 	u8 assoc_resp_len;
-	u8 assoc_info[1];
+	u8 assoc_info[];
 } __packed;
 
 /* Disconnect Event */