staging:vt6656: iwctl.c: Removed unneeded function

Removed the function iwctl_giwnwid, that just return a error code.

Changes v1 to v2:
	Removed same functions of vt6655 and vt6656.

Signed-off-by: Marcos Paulo de Souza <marcos.mage@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/vt6656/main_usb.c b/drivers/staging/vt6656/main_usb.c
index 27521b6..1b382a8 100644
--- a/drivers/staging/vt6656/main_usb.c
+++ b/drivers/staging/vt6656/main_usb.c
@@ -1618,15 +1618,8 @@
 		break;
 
 	case SIOCSIWNWID:
-        rc = -EOPNOTSUPP;
-		break;
-
 	case SIOCGIWNWID:     //0x8b03  support
-	#ifdef  WPA_SUPPLICANT_DRIVER_WEXT_SUPPORT
-          rc = iwctl_giwnwid(dev, NULL, &(wrq->u.nwid), NULL);
-	#else
-        rc = -EOPNOTSUPP;
-	#endif
+		rc = -EOPNOTSUPP;
 		break;
 
 		// Set frequency/channel