staging: wilc1000: fix return error code of wilc_deinit

It should be returned error code as -EFAULT instead of 0 when hif_drv is
NULL.
Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.c

@@ -3695,7 +3695,7 @@ int wilc_deinit(struct wilc_vif *vif)
 
 	if (!hif_drv)	{
 		PRINT_ER("hif_drv = NULL\n");
-		return 0;
+		return -EFAULT;
 	}
 
 	down(&hif_sema_deinit);