Warning fix.

dlls/x11drv/event.c

diff --git a/dlls/x11drv/event.c b/dlls/x11drv/event.c
index 8c18a55..aa0ea81 100644
--- a/dlls/x11drv/event.c
+++ b/dlls/x11drv/event.c
@@ -873,7 +873,7 @@
               if (hClipData && (lpClipData = GlobalLock(hClipData)))
               {
                   TRACE_(clipboard)("\tUpdating property %s, %ld bytes\n",
-                      lpFormat->Name, cBytes);
+                                    debugstr_w(lpFormat->Name), cBytes);
 
                   wine_tsx11_lock();
                   XChangeProperty(display, request, rprop, event->target,