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.h b/fs/xfs/xfs_da_btree.h
index 30cd08f..fe9f5a8 100644
--- a/fs/xfs/xfs_da_btree.h
+++ b/fs/xfs/xfs_da_btree.h
@@ -209,7 +209,8 @@
  */
 struct xfs_nameops {
 	xfs_dahash_t	(*hashname)(struct xfs_name *);
-	enum xfs_dacmp	(*compname)(struct xfs_da_args *, const char *, int);
+	enum xfs_dacmp	(*compname)(struct xfs_da_args *,
+					const unsigned char *, int);
 };
 
 
@@ -260,7 +261,7 @@
 
 uint xfs_da_hashname(const __uint8_t *name_string, int name_length);
 enum xfs_dacmp xfs_da_compname(struct xfs_da_args *args,
-				const char *name, int len);
+				const unsigned char *name, int len);
 
 
 xfs_da_state_t *xfs_da_state_alloc(void);