[base] Avoid crash while tracing `load_mac_face'.

Reported in Savannah bug #45919.

* src/base/ftobjs.c (load_mac_face): Honour FT_OPEN_MEMORY while
tracing.

ChangeLog

@@ -1,3 +1,12 @@
+2015-09-11  Werner Lemberg  <wl@gnu.org>
+
+	[base] Avoid crash while tracing `load_mac_face'.
+
+	Reported in Savannah bug #45919.
+
+	* src/base/ftobjs.c (load_mac_face): Honour FT_OPEN_MEMORY while
+	tracing.
+
 2015-09-11  Werner Lemberg  <wl@gnu.org>
 
 	[type42] Fix endless loop (#45920).

src/base/ftobjs.c

@@ -2037,7 +2037,11 @@
 #undef  FT_COMPONENT
 #define FT_COMPONENT  trace_raccess
 
-      FT_TRACE3(( "Try as dfont: %s ...", args->pathname ));
+#ifdef FT_DEBUG_LEVEL_TRACE
+      FT_TRACE3(( "Try as dfont: " ));
+      if ( !( args->flags & FT_OPEN_MEMORY ) )
+        FT_TRACE3(( "%s ...", args->pathname ));
+#endif
 
       error = IsMacResource( library, stream, 0, face_index, aface );