Add an identifier in the read_fn function declaration because based on
commit ca0d8929e75a ("checkpatch: add warning for unnamed function
definition arguments") it is the preferred coding style even C standard
allows both formats.

Signed-off-by: Piyush Mehta <piyush.mehta@amd.com>
---
 drivers/usb/gadget/udc/udc-xilinx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/udc-xilinx.c b/drivers/usb/gadget/udc/udc-xilinx.c
index 4827e3cd3834..609f7e30cf2c 100644
--- a/drivers/usb/gadget/udc/udc-xilinx.c
+++ b/drivers/usb/gadget/udc/udc-xilinx.c
@@ -192,7 +192,7 @@ struct xusb_udc {
 	bool dma_enabled;
 	struct clk *clk;
 
-	unsigned int (*read_fn)(void __iomem *);
+	unsigned int (*read_fn)(void __iomem *reg);
 	void (*write_fn)(void __iomem *, u32, u32);
 };
 
-- 
2.25.1