remove some unused code

Found by codacy.com

tests/core_tests/chaingen.h

@@ -511,7 +511,7 @@ inline bool do_replay_events(std::vector<test_event_entry>& events)
   // FIXME: make sure that vm has arg_testnet_on set to true or false if
   // this test needs for it to be so.
   get_test_options<t_test_class> gto;
-  if (!c.init(vm, NULL, &gto.test_options))
+  if (!c.init(vm, &gto.test_options))
   {
     MERROR("Failed to init core");
     return false;

tests/core_tests/transaction_tests.cpp

@@ -54,9 +54,6 @@ bool test_transaction_generation_and_ring_signature()
   account_base miner_acc6;
   miner_acc6.generate();
 
-  std::string add_str = miner_acc3.get_public_address_str(MAINNET);
-
-
   account_base rv_acc;
   rv_acc.generate();
   account_base rv_acc2;

tests/unit_tests/mnemonics.cpp

@@ -75,7 +75,6 @@ namespace
    */
   void test_language(const Language::Base &language)
   {
-    const std::vector<std::string> &word_list = language.get_word_list();
     epee::wipeable_string w_seed = "", w_return_seed = "";
     std::string seed, return_seed;
     // Generate a random seed without checksum

tests/unit_tests/multisig.cpp

@@ -112,7 +112,7 @@ static void make_wallets(std::vector<tools::wallet2>& wallets, unsigned int M)
   }
 
   for (auto& wallet: wallets) {
-    ASSERT_FALSE(wallet.multisig() || wallet.multisig() || wallet.multisig());
+    ASSERT_FALSE(wallet.multisig());
   }
 
   std::vector<std::string> mxis;

tests/unit_tests/ringct.cpp

@@ -968,8 +968,6 @@ static rctSig make_sig()
 #define TEST_rctSig_elements(name, op) \
 TEST(ringct, rctSig_##name) \
 { \
-  const uint64_t inputs[] = {1000, 1000}; \
-  const uint64_t outputs[] = {1000, 1000}; \
   rct::rctSig sig = make_sig(); \
   ASSERT_TRUE(rct::verRct(sig)); \
   op; \