vader: don't finalize an endpoint that is already finalized

Fixes trac:4252

cmr=v1.7.5:ticket=trac:4053

This commit was SVN r30668.

The following Trac tickets were found above:
  Ticket 4053 --> https://svn.open-mpi.org/trac/ompi/ticket/4053
  Ticket 4252 --> https://svn.open-mpi.org/trac/ompi/ticket/4252

ompi/mca/btl/vader/btl_vader_module.c

@@ -212,7 +212,7 @@ static int init_vader_endpoint (struct mca_btl_base_endpoint_t *ep, struct ompi_
 static int fini_vader_endpoint (struct mca_btl_base_endpoint_t *ep)
 {
 
-    if (ep->peer_smp_rank != MCA_BTL_VADER_LOCAL_RANK) {
+    if (NULL != ep->fbox_out) {
 #if OMPI_BTL_VADER_HAVE_XPMEM
         xpmem_release (ep->apid);
 #else