[MTD] [NAND] Replace -1 with -EBADMSG in nand error correction code

Magic numerical values are just bad style.  Particularly so when
undocumented.

Signed-off-by: Jörn Engel <joern@logfs.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c
index ab9f5c5..0e72153 100644
--- a/drivers/mtd/nand/diskonchip.c
+++ b/drivers/mtd/nand/diskonchip.c
@@ -220,7 +220,7 @@
 		}
 	}
 	/* If the parity is wrong, no rescue possible */
-	return parity ? -1 : nerr;
+	return parity ? -EBADMSG : nerr;
 }
 
 static void DoC_Delay(struct doc_priv *doc, unsigned short cycles)
@@ -1034,7 +1034,7 @@
 		WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
 	else
 		WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
-	if (no_ecc_failures && (ret == -1)) {
+	if (no_ecc_failures && (ret == -EBADMSG)) {
 		printk(KERN_ERR "suppressing ECC failure\n");
 		ret = 0;
 	}
diff --git a/drivers/mtd/nand/nand_ecc.c b/drivers/mtd/nand/nand_ecc.c
index fde593e..9003a135 100644
--- a/drivers/mtd/nand/nand_ecc.c
+++ b/drivers/mtd/nand/nand_ecc.c
@@ -189,7 +189,7 @@
 	if(countbits(s0 | ((uint32_t)s1 << 8) | ((uint32_t)s2 <<16)) == 1)
 		return 1;
 
-	return -1;
+	return -EBADMSG;
 }
 EXPORT_SYMBOL(nand_correct_data);