ext4: remove Opt_ignore

This is completely unused so let's just get rid of it.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

fs/ext4/super.c

@@ -1341,7 +1341,7 @@ enum {
 	Opt_data_err_abort, Opt_data_err_ignore,
 	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
-	Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
+	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
 	Opt_usrquota, Opt_grpquota, Opt_i_version,
 	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
 	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
@@ -1784,8 +1784,6 @@ static int parse_options(char *options, struct super_block *sb,
 			else
 				clear_opt(sb, BARRIER);
 			break;
-		case Opt_ignore:
-			break;
 		case Opt_nobh:
 			ext4_msg(sb, KERN_WARNING,
 				 "Ignoring deprecated nobh option");