usb: composite.h: fix two warnings when building docs

By definition, we use /* private: */ tag when we won't be documenting
a parameter. However, those two parameters are documented:

./include/linux/usb/composite.h:510: warning: Excess struct/union/enum/typedef member 'setup_pending' description in 'usb_composite_dev'
./include/linux/usb/composite.h:510: warning: Excess struct/union/enum/typedef member 'os_desc_pending' description in 'usb_composite_dev'

So, we need to use /* public: */ to avoid a warning.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

include/linux/usb/composite.h

@@ -504,8 +504,9 @@ struct usb_composite_dev {
 	/* protects deactivations and delayed_status counts*/
 	spinlock_t			lock;
 
-	unsigned			setup_pending:1;
-	unsigned			os_desc_pending:1;
+	/* public: */
+	unsigned int			setup_pending:1;
+	unsigned int			os_desc_pending:1;
 };
 
 extern int usb_string_id(struct usb_composite_dev *c);