staging: wfx: drop useless union hif_event_data

The union hif_event_data is never used in the driver. So, it is
not necessary to declare it separately from hif_ind_event.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200907101521.66082-24-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/hif_api_cmd.h

@@ -548,15 +548,13 @@ enum hif_ps_mode_error {
 	HIF_PS_ERROR_AP_NO_DATA_AFTER_TIM          = 4
 };
 
-union hif_event_data {
-	u8     rcpi_rssi;
-	__le32 ps_mode_error;
-	__le32 peer_sta_set;
-};
-
 struct hif_ind_event {
 	__le32 event_id;
-	union hif_event_data event_data;
+	union {
+		u8     rcpi_rssi;
+		__le32 ps_mode_error;
+		__le32 peer_sta_set;
+	} event_data;
 } __packed;