usb: dwc3: debug: fix checkpatch warning

no functional changes
Signed-off-by: NFelipe Balbi <balbi@kernel.org>

drivers/usb/dwc3/debug.h

@@ -413,8 +413,8 @@ static inline const char *dwc3_gadget_generic_cmd_status_string(int status)
 
 
 #ifdef CONFIG_DEBUG_FS
-extern void dwc3_debugfs_init(struct dwc3 *);
-extern void dwc3_debugfs_exit(struct dwc3 *);
+extern void dwc3_debugfs_init(struct dwc3 *d);
+extern void dwc3_debugfs_exit(struct dwc3 *d);
 #else
 static inline void dwc3_debugfs_init(struct dwc3 *d)
 {  }