Don't double-enqueue packets for delete.

.patch

commit 0d6fe2f32bcece6ecacfabfc894846a9a3d2f262
Author: Josh Allmann <joshua.allmann@gmail.com>
Date:   Thu May 10 16:40:03 2012 -0700

    -- Don't double-enqueue packets for delete.
    
    This may lead to an infinite loop in some cases,
    especially with dependent protocols that are not chained.

diff --git a/sources/thelib/src/protocols/baseprotocol.cpp b/sources/thelib/src/protocols/baseprotocol.cpp
index 3b08a48..2a2771d 100644
--- a/sources/thelib/src/protocols/baseprotocol.cpp
+++ b/sources/thelib/src/protocols/baseprotocol.cpp
@@ -199,6 +199,7 @@ BaseProtocol *BaseProtocol::GetNearEndpoint() {
 }
 
 void BaseProtocol::EnqueueForDelete() {
+	if (_enqueueForDelete) return;
 	_enqueueForDelete = true;
 	ProtocolManager::EnqueueForDelete(this);
 }