Fix compilation for Openwrt

  CC [M]
/media/Standard/openwrt/openwrt-sdk-24.10.0-rc2-mediatek-filogic_gcc-13.3.0_musl.Linux-x86_64/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_filogic/rtw88-usb-2024.11.27~611874c6/usb.o
/media/Standard/openwrt/openwrt-sdk-24.10.0-rc2-mediatek-filogic_gcc-13.3.0_musl.Linux-x86_64/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_filogic/rtw88-usb-2024.11.27~611874c6/usb.c:
In function 'rtw_usb_init_rx':
/media/Standard/openwrt/openwrt-sdk-24.10.0-rc2-mediatek-filogic_gcc-13.3.0_musl.Linux-x86_64/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_filogic/rtw88-usb-2024.11.27~611874c6/usb.c:943:22:
error: cast between incompatible function types from 'void (*)(struct
rtw_usb *)' to 'void (*)(long unsigned int)'
[-Werror=cast-function-type]
  943 |                      (void(*)(unsigned long))rtw_usb_rx_handler,
      |                      ^
cc1: all warnings being treated as errors

Fixes #253.

Signed-off-by: Bitterblue Smith <[email protected]>

usb.c

@@ -554,8 +554,9 @@ static void rtw_usb_rx_handler(struct work_struct *work)
 {
 	struct rtw_usb *rtwusb = container_of(work, struct rtw_usb, rx_work);
 #else
-static void rtw_usb_rx_handler(struct rtw_usb *rtwusb)
+static void rtw_usb_rx_handler(unsigned long shut_up_gcc)
 {
+	struct rtw_usb *rtwusb = (struct rtw_usb *)shut_up_gcc;
 #endif
 	struct rtw_dev *rtwdev = rtwusb->rtwdev;
 	const struct rtw_chip_info *chip = rtwdev->chip;
@@ -939,8 +940,7 @@ static int rtw_usb_init_rx(struct rtw_dev *rtwdev)
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 9, 0)
 	rtwusb->rxwq = alloc_workqueue("rtw88_usb: rx wq", WQ_BH, 0);
 #else
-	tasklet_init(&rtwusb->rx_tasklet,
-		     (void(*)(unsigned long))rtw_usb_rx_handler,
+	tasklet_init(&rtwusb->rx_tasklet, rtw_usb_rx_handler,
 		     (unsigned long)rtwusb);
 
 	rtwusb->rxwq = create_singlethread_workqueue("rtw88_usb: rx wq");