[autofit] Minor fix.

* src/autofit/afglobal.c (af_face_globals_compute_style_coverage): Avoid
compiler warning.
diff --git a/src/autofit/afglobal.c b/src/autofit/afglobal.c
index bf2f19d..c395f64 100644
--- a/src/autofit/afglobal.c
+++ b/src/autofit/afglobal.c
@@ -301,7 +301,7 @@
           if ( !( count % 10 ) )
             FT_TRACE4(( " " ));
 
-          FT_TRACE4(( " %ld", idx ));
+          FT_TRACE4(( " %d", idx ));
           count++;
 
           if ( !( count % 10 ) )