staging: wlan-ng: Replace data type declaration with variable of same type in prism2mgmt.c

sizeof(var) instead of sizeof(struct XXX) is preferred.

It also fix the following checkpatch.pl script warning:
WARNING: line over 80 characters

Fix this two in prism2mgmt.c file.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlan-ng/prism2mgmt.c

@@ -293,7 +293,7 @@ int prism2mgmt_scan(struct wlandevice *wlandev, void *msgp)
 
 	result = hfa384x_drvr_setconfig(hw,
 					HFA384x_RID_HOSTSCAN, &scanreq,
-					sizeof(struct hfa384x_host_scan_request_data));
+					sizeof(scanreq));
 	if (result) {
 		netdev_err(wlandev->netdev,
 			   "setconfig(SCANREQUEST) failed. result=%d\n",