wimax: fix kernel-doc for debufs_dentry member of struct wimax_dev

Reported by Randy Dunlap from a warning in the v2.6.29 merge window
tree as of 2009/1/8.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/wimax.h

@@ -323,6 +323,9 @@ struct input_dev;
  *
  * @rf_hw: [private] State of the hardware radio switch (OFF/ON)
  *
+ * @debufs_dentry: [private] Used to hook up a debugfs entry. This
+ *     shows up in the debugfs root as wimax:DEVICENAME.
+ *
  * Description:
  * This structure defines a common interface to access all WiMAX
  * devices from different vendors and provides a common API as well as