staging: wlan-ng: correction to comment in hfa384x_usb

The comment for hfa384x_docmd incorrectly states that usercb_data
should be NULL for DOASYNC calls; in fact, it should be NULL for
DOWAIT calls (this is consistent with the other similar functions and
the rest of the comment text).

Signed-off-by: Tim Collier <osdevtc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlan-ng/hfa384x_usb.c

@@ -1290,7 +1290,7 @@ cleanup:
  *	cmdcb		command-specific callback
  *	usercb		user callback for async calls, NULL for DOWAIT calls
  *	usercb_data	user supplied data pointer for async calls, NULL
- *			for DOASYNC calls
+ *			for DOWAIT calls
  *
  * Returns:
  *	0		success