face: fix controller creation bug that dismisses nrd-0.1 as unsupported

refs: #1398

Change-Id: Icde191b4e5528b15cda2a569248b7038162bd8c3
diff --git a/src/face.cpp b/src/face.cpp
index 2773f07..a8b59e9 100644
--- a/src/face.cpp
+++ b/src/face.cpp
@@ -90,7 +90,7 @@
     {
       m_fwController = make_shared<nrd::Controller>(boost::ref(*this));
     }
-  if (isSupportedNfdProtocol(protocol))
+  else if (isSupportedNfdProtocol(protocol))
     {
       m_fwController = make_shared<nfd::Controller>(boost::ref(*this));
     }