fix gcc 5.4 warnings

Jan Willamowius

2019-04-22 ee2a290abf16f4fd4736c2f4e17e9cff87f50447

 test/functional/volid_test.cpp

@@ -109,7 +109,7 @@
                continue;
         PcSignature pcsig;
         strncpy(pcsig, reference_signatures[i].c_str(),
               sizeof(PcSignature));
               sizeof(PcSignature)-1);
         EVENT_TYPE val_result = validate_pc_signature(pcsig);
         BOOST_TEST_CHECKPOINT("Verifying signature: ");
         BOOST_CHECK_EQUAL(val_result, LICENSE_OK);