pio: add missing copyright note

and remove unused macro

pio.c

+/*
+ * (C) Copyright 2011 Henrik Nordstrom <henrik@henriknordstrom.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
 /* needs _BSD_SOURCE for htole and letoh  */
 #define _BSD_SOURCE
 
@@ -14,8 +33,6 @@
 #define PIO_REG_SIZE 0x228 /*0x300*/
 #define PIO_PORT_SIZE 0x24
 
-#define errf(...)	fprintf(stderr, __VA_ARGS__)
-
 struct pio_status {
 	int mul_sel;
 	int pull;