Added error checking to stream_socket_accept (it can return false)

Author: AndrewCarterUK

src/Connection/StreamSocketConnectionPool.php

@@ -114,6 +114,10 @@ protected function acceptConnection(ConnectionHandlerFactoryInterface $connectio
     {
         $clientSocket = stream_socket_accept($this->serverSocket);
 
+        if (false === $clientSocket) {
+            return;
+        }
+
         stream_set_blocking($clientSocket, 0);
 
         $connection = new StreamSocketConnection($clientSocket);