usbdevfs_urb: __user annotation

fix warning:
drivers/usb/core/devio.c:1226:20: warning: incorrect type in assignment (different address spaces)
drivers/usb/core/devio.c:1226:20: expected void *usercontext
drivers/usb/core/devio.c:1226:20: got void [noderef] <asn:1>*

---
 include/linux/usbdevice_fs.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index 8ca5a7f..17cb108 100644
@@ -104,7 +104,7 @@ struct usbdevfs_urb {
 	int error_count;
 	unsigned int signr;	/* signal to be sent on completion,
 				  or 0 if none should be sent. */
-	void *usercontext;
+	void __user *usercontext;
 	struct usbdevfs_iso_packet_desc iso_frame_desc[0];
 };
 

--
1.5.3.4