tests: fix "defined but not used" build error with gcc-5

Change-Id: If0cce184f88d76333956e5957db91d5b03e16d39
Refs: #2767
diff --git a/tests/daemon/mgmt/manager-base.t.cpp b/tests/daemon/mgmt/manager-base.t.cpp
index f3ea152..ff2f0d4 100644
--- a/tests/daemon/mgmt/manager-base.t.cpp
+++ b/tests/daemon/mgmt/manager-base.t.cpp
@@ -32,8 +32,6 @@
 namespace nfd {
 namespace tests {
 
-NFD_LOG_INIT("ManagerBaseTest");
-
 class TestCommandVoidParameters : public ndn::nfd::ControlCommand
 {
 public: