mtd: nand: marvell: remove redundant variable 'oob_len'

Variable oob_len is assigned and never read, hence it is redundant and
can be removed.

Cleans up clang warnings:

drivers/mtd/nand/marvell_nand.c:1356:6: warning: Value stored to 'oob_len'
during its initialization is never read
drivers/mtd/nand/marvell_nand.c:1369:4: warning: Value stored to 'oob_len'
is never read
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/nand/marvell_nand.c

@@ -1353,7 +1353,6 @@ static int marvell_nfc_hw_ecc_bch_write_page_raw(struct mtd_info *mtd,
 	int data_len = lt->data_bytes;
 	int spare_len = lt->spare_bytes;
 	int ecc_len = lt->ecc_bytes;
-	int oob_len = spare_len + ecc_len;
 	int spare_offset = 0;
 	int ecc_offset = (lt->full_chunk_cnt * lt->spare_bytes) +
 		lt->last_spare_bytes;
@@ -1366,7 +1365,6 @@ static int marvell_nfc_hw_ecc_bch_write_page_raw(struct mtd_info *mtd,
 			data_len = lt->last_data_bytes;
 			spare_len = lt->last_spare_bytes;
 			ecc_len = lt->last_ecc_bytes;
-			oob_len = spare_len + ecc_len;
 		}
 
 		/* Point to the column of the next chunk */