[buffer] Rename swap_buffers() to sync()
diff --git a/src/gen-vowel-constraints.py b/src/gen-vowel-constraints.py
index 184ec29..42afd28 100755
--- a/src/gen-vowel-constraints.py
+++ b/src/gen-vowel-constraints.py
@@ -220,7 +220,7 @@
 print ('    default:')
 print ('      break;')
 print ('  }')
-print ('  buffer->swap_buffers ();')
+print ('  buffer->sync ();')
 print ('}')
 
 print ()