staging: vt6655: update out-of-date function declaration

The function iwctl_siwscan() is defined in iwctl.c as:
int iwctl_siwscan(struct net_device *dev,
		  struct iw_request_info *info,
		  struct iw_point *wrq,
		  char *extra)
{
  ...

This patch updates iwctl.h so that the type of the 3rd parameter (*wqr) in the
function declaration matches the definition.
Signed-off-by: James A Shackleford <shack@linux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6655/iwctl.h

@@ -168,7 +168,7 @@ int iwctl_giwscan(struct net_device *dev,
 
 int iwctl_siwscan(struct net_device *dev,
 		  struct iw_request_info *info,
-		  struct iw_param *wrq,
+		  struct iw_point *wrq,
 		  char *extra);
 
 //2008-0409-07, <Add> by Einsn Liu