Merge pull request #571 from ethereum/network

thread-safety, WhisperPeer::sendMessages()

libwhisper/WhisperPeer.cpp

@@ -81,11 +81,9 @@ bool WhisperPeer::interpret(unsigned _id, RLP const& _r)
 }
 
 void WhisperPeer::sendMessages()
-{
-	if (m_unseen.size())
 {
 	RLPStream amalg;
-		unsigned msgCount;
+	unsigned msgCount = 0;
 	{
 		Guard l(x_unseen);
 		msgCount = m_unseen.size();
@@ -97,6 +95,8 @@ void WhisperPeer::sendMessages()
 		}
 	}
 	
+	if (msgCount)
+	{
 		RLPStream s;
 		prep(s, MessagesPacket, msgCount).appendRaw(amalg.out(), msgCount);
 		sealAndSend(s);