wifi: rsi: rsi_91x_usb_ops: Remove unnecessary (void*) conversions

No need cast (void*) to (struct rsi_91x_usbdev *).
Signed-off-by: Wu Yunchuan <yunchuan@nfschina.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230803073606.3667062-1-yunchuan@nfschina.com

drivers/net/wireless/rsi/rsi_91x_usb_ops.c

@@ -28,7 +28,7 @@
 void rsi_usb_rx_thread(struct rsi_common *common)
 {
 	struct rsi_hw *adapter = common->priv;
-	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	struct rsi_91x_usbdev *dev = adapter->rsi_dev;
 	int status;
 	struct sk_buff *skb;