mtd: nand: fix erroneous read_buf call in nand_write_page_raw_syndrome

read_buf is called in place of write_buf in the
nand_write_page_raw_syndrome function.
Signed-off-by: Boris BREZILLON <b.brezillon.dev@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/nand/nand_base.c

@@ -2002,7 +2002,7 @@ static int nand_write_page_raw_syndrome(struct mtd_info *mtd,
 			oob += chip->ecc.prepad;
 		}
 
-		chip->read_buf(mtd, oob, eccbytes);
+		chip->write_buf(mtd, oob, eccbytes);
 		oob += eccbytes;
 
 		if (chip->ecc.postpad) {