staging: gpib: fix kernel-doc section for write_loop() function

Add a colon character in the kernel-doc section of write_loop() in order
'leng' to be picked as argument by the kernel-doc compiler.

This change fix the following warning:

warning: Function parameter or struct member 'leng' not described in
'send_command'

Signed-off-by: Gaston Gonzalez <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gascoar

drivers/staging/gpib/lpvo_usb_gpib/lpvo_usb_gpib.c

@@ -232,7 +232,7 @@ static int write_loop(void *dev, char *msg, int leng)
  *
  * @board:    the gpib_board_struct data area for this gpib interface
  * @msg:      the byte sequence.
- * @leng      the byte sequence length; can be given as zero and is
+ * @leng:     the byte sequence length; can be given as zero and is
  *	      computed automatically, but if 'msg' contains a zero byte,
  *	      it has to be given explicitly.
  */