Small fix for a egde case

This commit was SVN r22322.

orte/mca/snapc/full/snapc_full_local.c

@@ -1790,10 +1790,13 @@ static int snapc_full_local_get_vpids(void)
             opal_list_append(&snapc_local_vpids, &(vpid_snapshot->super.super));
         }
 
+        /* Only update if the PID is -not- already set */
+        if( 0 >= vpid_snapshot->process_pid ) {
             vpid_snapshot->process_pid              = child->pid;
             vpid_snapshot->super.process_name.jobid = child->name->jobid;
             vpid_snapshot->super.process_name.vpid  = child->name->vpid;
         }
+    }
 
     return ORTE_SUCCESS;
 }