onenand: fix oob print out issue

Seems original implementation forget to set the pointer to point
to the oobbuf, so when we want to see oob buf, we see nothing...
Fix it by get pointer as the oobbuf set.

Signed-off-by: Lei Wen <leiwen@marvell.com>

common/cmd_onenand.c

@@ -293,7 +293,7 @@ static int onenand_dump(struct mtd_info *mtd, ulong off, int only_oob)
 	addr = (loff_t) off;
 	memset(&ops, 0, sizeof(ops));
 	ops.datbuf = datbuf;
-	ops.oobbuf = oobbuf; /* must exist, but oob data will be appended to ops.datbuf */
+	ops.oobbuf = oobbuf;
 	ops.len = mtd->writesize;
 	ops.ooblen = mtd->oobsize;
 	ops.retlen = 0;
@@ -319,6 +319,8 @@ static int onenand_dump(struct mtd_info *mtd, ulong off, int only_oob)
 	}
 	puts("OOB:\n");
 	i = mtd->oobsize >> 3;
+	p = oobbuf;
+
 	while (i--) {
 		printf("\t%02x %02x %02x %02x %02x %02x %02x %02x\n",
 		       p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);