nacl_io: accept now allows addr and len to be NULL

native_client_sdk/src/libraries/nacl_io/socket/tcp_node.cc

Index: native_client_sdk/src/libraries/nacl_io/socket/tcp_node.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/socket/tcp_node.cc b/native_client_sdk/src/libraries/nacl_io/socket/tcp_node.cc
index 69f657805b53de036c623cbddf58e17bd89ee2f6..738206eb730992f3c8c0fbbaa8437742c0523ebb 100644
--- a/native_client_sdk/src/libraries/nacl_io/socket/tcp_node.cc
+++ b/native_client_sdk/src/libraries/nacl_io/socket/tcp_node.cc
@@ -453,9 +453,11 @@ Error TcpNode::Accept(const HandleAttr& attr,
   emitter_->ClearEvents_Locked(POLLIN);
 
   // Set the out paramaters
-  PP_Resource remote_addr = TCPInterface()->GetRemoteAddress(*out_sock);
-  *len = ResourceToSockAddr(remote_addr, *len, addr);
-  filesystem_->ppapi()->ReleaseResource(remote_addr);
+  if (addr && len) {
+    PP_Resource remote_addr = TCPInterface()->GetRemoteAddress(*out_sock);
+    *len = ResourceToSockAddr(remote_addr, *len, addr);
+    filesystem_->ppapi()->ReleaseResource(remote_addr);
+  }
 
   QueueAccept();
   return 0;