Reference count must be zero before calling uip_tcpfree()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2065 42af7a65-404d-4744-a932-0658087f49c3

net/uip/uip_tcpbacklog.c

@@ -196,6 +196,7 @@ int uip_backlogdestroy(FAR struct uip_conn *conn)
 
                blconn->blparent = NULL;
                blconn->backlog  = NULL;
+               blconn->crefs    = 0;
                uip_tcpfree(blconn);
              }
          }

net/uip/uip_tcpinput.c

@@ -173,6 +173,7 @@ void uip_tcpinput(struct uip_driver_s *dev)
                 {
                   /* No, then we have to give the connection back */
 
+                  conn->crefs     = 0;
                   uip_tcpfree(conn);
                   conn = NULL;
                 }