Fix compilation after namespace change in ndn-cxx

refs: #2951

Change-Id: Ia9f3caee4733e7f137b5f6f22f7e154069b37f69
diff --git a/src/tlv/adjacency.cpp b/src/tlv/adjacency.cpp
index e9912b0..3a24356 100644
--- a/src/tlv/adjacency.cpp
+++ b/src/tlv/adjacency.cpp
@@ -45,21 +45,19 @@
 
 template<bool T>
 size_t
-Adjacency::wireEncode(ndn::EncodingImpl<T>& block) const
+Adjacency::wireEncode(ndn::EncodingImpl<T>& encoder) const
 {
   size_t totalLength = 0;
 
-  totalLength += ndn::prependNonNegativeIntegerBlock(block,
-                                                     ndn::tlv::nlsr::Cost,
-                                                     m_cost);
+  totalLength += prependNonNegativeIntegerBlock(encoder, ndn::tlv::nlsr::Cost, m_cost);
 
-  totalLength += block.prependByteArrayBlock(
+  totalLength += encoder.prependByteArrayBlock(
     ndn::tlv::nlsr::Uri, reinterpret_cast<const uint8_t*>(m_uri.c_str()), m_uri.size());
 
-  totalLength += m_name.wireEncode(block);
+  totalLength += m_name.wireEncode(encoder);
 
-  totalLength += block.prependVarNumber(totalLength);
-  totalLength += block.prependVarNumber(ndn::tlv::nlsr::Adjacency);
+  totalLength += encoder.prependVarNumber(totalLength);
+  totalLength += encoder.prependVarNumber(ndn::tlv::nlsr::Adjacency);
 
   return totalLength;
 }