encrypted-keys: fix Opt_err/Opt_error = -1

Properly start the enumeration associated with match_table_t at zero,
making Opt_err/Opt_error the last enumeration value.
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

security/keys/encrypted-keys/encrypted.c

@@ -60,11 +60,11 @@ static int blksize;
 static struct crypto_shash *hash_tfm;
 
 enum {
-	Opt_err = -1, Opt_new, Opt_load, Opt_update
+	Opt_new, Opt_load, Opt_update, Opt_err
 };
 
 enum {
-	Opt_error = -1, Opt_default, Opt_ecryptfs, Opt_enc32
+	Opt_default, Opt_ecryptfs, Opt_enc32, Opt_error
 };
 
 static const match_table_t key_format_tokens = {