face: fix compilation with clang 7

Change-Id: Ic07ee2405d53107a089ec2b53ef3c8bed105dd01
diff --git a/daemon/face/stream-transport.hpp b/daemon/face/stream-transport.hpp
index 750432f..acc92e0 100644
--- a/daemon/face/stream-transport.hpp
+++ b/daemon/face/stream-transport.hpp
@@ -247,7 +247,7 @@
   NFD_LOG_FACE_TRACE("Received: " << nBytesReceived << " bytes");
 
   m_receiveBufferSize += nBytesReceived;
-  auto unparsedBytes = ndn::span(m_receiveBuffer).first(m_receiveBufferSize);
+  auto unparsedBytes = ndn::make_span(m_receiveBuffer).first(m_receiveBufferSize);
   while (!unparsedBytes.empty()) {
     auto [isOk, element] = Block::fromBuffer(unparsedBytes);
     if (!isOk)