Rename HB_BUFFER_DIFF_FLAG_MASK_MISMATCH to HB_BUFFER_DIFF_FLAG_GLYPH_FLAGS_MISMATCH
diff --git a/src/hb-buffer.h b/src/hb-buffer.h
index 98f83ff..9f5943e 100644
--- a/src/hb-buffer.h
+++ b/src/hb-buffer.h
@@ -491,7 +491,7 @@
    * and report which aspect(s) of the glyph info/position are different. */
   HB_BUFFER_DIFF_FLAG_CODEPOINT_MISMATCH	= 0x0010,
   HB_BUFFER_DIFF_FLAG_CLUSTER_MISMATCH		= 0x0020,
-  HB_BUFFER_DIFF_FLAG_MASK_MISMATCH		= 0x0040,
+  HB_BUFFER_DIFF_FLAG_GLYPH_FLAGS_MISMATCH	= 0x0040,
   HB_BUFFER_DIFF_FLAG_POSITION_MISMATCH		= 0x0080
 
 } hb_buffer_diff_flags_t;