[MTD] [NOR] STAA: use writesize instead off eccsize to represent ECC block

The cfi_staa_write_buffers() uses mtd->eccsize but means mtd->writesize.
BTW, mtd-eccsize is broken and is not initialized, which means the code
fixed by this patch is broken/unused anyway.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/drivers/mtd/chips/cfi_cmdset_0020.c b/drivers/mtd/chips/cfi_cmdset_0020.c
index d56849f..69d49e0 100644
--- a/drivers/mtd/chips/cfi_cmdset_0020.c
+++ b/drivers/mtd/chips/cfi_cmdset_0020.c
@@ -662,7 +662,7 @@
  * a small buffer for this.
  * XXX: If the buffer size is not a multiple of 2, this will break
  */
-#define ECCBUF_SIZE (mtd->eccsize)
+#define ECCBUF_SIZE (mtd->writesize)
 #define ECCBUF_DIV(x) ((x) & ~(ECCBUF_SIZE - 1))
 #define ECCBUF_MOD(x) ((x) &  (ECCBUF_SIZE - 1))
 static int