[MTD] NAND: Move the NULL check into the calling function

 *	The AG-AND chips have nice features for speed improvement,

 *	which are not supported yet. Read / program 4 pages in one go.

 *

 * $Id: nand_base.c,v 1.139 2005/04/04 18:02:23 dbrown Exp $

 * $Id: nand_base.c,v 1.140 2005/04/04 18:56:29 gleixner Exp $

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 */

static int nand_read (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf)

{

	return nand_do_read_ecc (mtd, from, len, retlen, buf, NULL, NULL, 0xff);

	return nand_do_read_ecc (mtd, from, len, retlen, buf, NULL, &mtd->oobinfo, 0xff);

}

static int nand_read_ecc (struct mtd_info *mtd, loff_t from, size_t len,

			  size_t * retlen, u_char * buf, u_char * oob_buf, struct nand_oobinfo *oobsel)

{

	/* use userspace supplied oobinfo, if zero */

	if (oobsel == NULL)

		oobsel = &mtd->oobinfo;

	return nand_do_read_ecc(mtd, from, len, retlen, buf, oob_buf, oobsel, 0xff);

}

 * @retlen:	pointer to variable to store the number of read bytes

 * @buf:	the databuffer to put data

 * @oob_buf:	filesystem supplied oob data buffer (can be NULL)

 * @oobsel:	oob selection structure (can be NULL)

 * @oobsel:	oob selection structure

 * @flags:	flag to indicate if nand_get_device/nand_release_device should be preformed

 *		and how many corrected error bits are acceptable:

 *		  bits 0..7 - number of tolerable errors

			     size_t * retlen, u_char * buf, u_char * oob_buf, 

			     struct nand_oobinfo *oobsel, int flags)

{

	/* use userspace supplied oobinfo, if zero */

	if (oobsel == NULL)

		oobsel = &mtd->oobinfo;

	int i, j, col, realpage, page, end, ecc, chipnr, sndcmd = 1;

	int read = 0, oob = 0, ecc_status = 0, ecc_failed = 0;