fs: use get_nand_dev_by_index()

As part of preparation for nand DM conversion the new API has been
introduced to remove direct access to nand_info array. So, use it here
instead of accessing to nand_info array directly.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
diff --git a/fs/jffs2/jffs2_1pass.c b/fs/jffs2/jffs2_1pass.c
index ed60c5b..4c6dfbf 100644
--- a/fs/jffs2/jffs2_1pass.c
+++ b/fs/jffs2/jffs2_1pass.c
@@ -175,10 +175,15 @@
 static int read_nand_cached(u32 off, u32 size, u_char *buf)
 {
 	struct mtdids *id = current_part->dev->id;
+	struct mtd_info *mtd;
 	u32 bytes_read = 0;
 	size_t retlen;
 	int cpy_bytes;
 
+	mtd = get_nand_dev_by_index(id->num);
+	if (!mtd)
+		return -1;
+
 	while (bytes_read < size) {
 		if ((off + bytes_read < nand_cache_off) ||
 		    (off + bytes_read >= nand_cache_off+NAND_CACHE_SIZE)) {
@@ -195,8 +200,8 @@
 			}
 
 			retlen = NAND_CACHE_SIZE;
-			if (nand_read(nand_info[id->num], nand_cache_off,
-						&retlen, nand_cache) != 0 ||
+			if (nand_read(mtd, nand_cache_off,
+				      &retlen, nand_cache) != 0 ||
 					retlen != NAND_CACHE_SIZE) {
 				printf("read_nand_cached: error reading nand off %#x size %d bytes\n",
 						nand_cache_off, NAND_CACHE_SIZE);