mwifiex: ensure "disable auto DS" struct is initialized

The .idle_time field *should* be unused, but technically, we're allowing
unitialized stack garbage to pass all the way through to the firmware
host command. Let's zero it out instead.
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/sta_ioctl.c

@@ -654,9 +654,9 @@ int mwifiex_get_bss_info(struct mwifiex_private *priv,
  */
 int mwifiex_disable_auto_ds(struct mwifiex_private *priv)
 {
-	struct mwifiex_ds_auto_ds auto_ds;
-
-	auto_ds.auto_ds = DEEP_SLEEP_OFF;
+	struct mwifiex_ds_auto_ds auto_ds = {
+		.auto_ds = DEEP_SLEEP_OFF,
+	};
 
 	return mwifiex_send_cmd(priv, HostCmd_CMD_802_11_PS_MODE_ENH,
 				DIS_AUTO_PS, BITMAP_AUTO_DS, &auto_ds, true);