xfs: convert dirnameops to unsigned char names

To be consistent across the codebase, convert the dirnameops to pass
the directory names by unsigned char strings.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/xfs/xfs_da_btree.c b/fs/xfs/xfs_da_btree.c
index c0c8869..0ca556b 100644
--- a/fs/xfs/xfs_da_btree.c
+++ b/fs/xfs/xfs_da_btree.c
@@ -1534,8 +1534,8 @@
 enum xfs_dacmp
 xfs_da_compname(
 	struct xfs_da_args *args,
-	const char 	*name,
-	int 		len)
+	const unsigned char *name,
+	int		len)
 {
 	return (args->namelen == len && memcmp(args->name, name, len) == 0) ?
 					XFS_CMP_EXACT : XFS_CMP_DIFFERENT;