Don't issue error message if message number in application range.

diff --git a/dlls/comctl32/treeview.c b/dlls/comctl32/treeview.c
index d7533fa..2197f85 100644
--- a/dlls/comctl32/treeview.c
+++ b/dlls/comctl32/treeview.c
@@ -5374,7 +5374,7 @@
 
     default:
 	/* This mostly catches MFC and Delphi messages. :( */
-	if (uMsg >= WM_USER)
+	if ((uMsg >= WM_USER) && (uMsg < WM_APP))
 	    TRACE("Unknown msg %04x wp=%08x lp=%08lx\n", uMsg, wParam, lParam);
 def:
 	return DefWindowProcA(hwnd, uMsg, wParam, lParam);