Fixed a typo.

diff --git a/dlls/x11drv/clipboard.c b/dlls/x11drv/clipboard.c
index ca24473..adf1752 100644
--- a/dlls/x11drv/clipboard.c
+++ b/dlls/x11drv/clipboard.c
@@ -1387,7 +1387,7 @@
 
     if (!hWndClipWindow)
     {
-        WARN("No window available to retrieve selection!n");
+        WARN("No window available to retrieve selection!\n");
         return -1;
     }