ldp: avoid calling write in destructors

Change-Id: Ia9c3d7a68a23dc4ab3be06f88fdfb053db422372
Signed-off-by: Florin Coras <fcoras@cisco.com>
diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index 07136e9..dbb0d65 100644
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -862,8 +862,8 @@
 
   if (vcm->is_init)
     {
-      clib_warning ("vcl<%u> already initialized", getpid ());
-      return -1;
+      VDBG (1, "already initialized");
+      return VPPCOM_EEXIST;
     }
 
   vcm->is_init = 1;