switch minix to simple_fsync()

* get minix_write_inode() to honour the second argument
* now we can use simple_fsync() for minixfs

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/minix/dir.c

@@ -22,7 +22,7 @@ static int minix_readdir(struct file *, void *, filldir_t);
 const struct file_operations minix_dir_operations = {
 	.read		= generic_read_dir,
 	.readdir	= minix_readdir,
-	.fsync		= minix_sync_file,
+	.fsync		= simple_fsync,
 };
 
 static inline void dir_put_page(struct page *page)