minor, tweak spacing

turn 8 spaces to tab, add space before Null/Crap
diff --git a/src/hb-face.cc b/src/hb-face.cc
index 2da0af4..e4d8a3f 100644
--- a/src/hb-face.cc
+++ b/src/hb-face.cc
@@ -226,7 +226,7 @@
 hb_face_t *
 hb_face_get_empty ()
 {
-  return const_cast<hb_face_t *> (&Null(hb_face_t));
+  return const_cast<hb_face_t *> (&Null (hb_face_t));
 }