staging: r8188eu: remove struct io_req

struct io_req is not needed in the r8188eu driver. Remove it.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20230111195640.306748-16-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/rtw_io.h

@@ -25,20 +25,6 @@
 struct intf_priv;
 struct intf_hdl;
 
-struct io_req {
-	struct list_head list;
-	u32	addr;
-	u32	val;
-	u32	command;
-	u32	status;
-	u8	*pbuf;
-	struct semaphore sema;
-
-	void (*_async_io_callback)(struct adapter *padater,
-				   struct io_req *pio_req, u8 *cnxt);
-	u8 *cnxt;
-};
-
 struct	intf_hdl {
 	struct adapter *padapter;
 	struct dvobj_priv *pintf_dev;