[tests] Avoid redundant assignments. Remove unused variables.

src/test/scriptnum_tests.cpp

@@ -29,10 +29,7 @@ static void CheckCreateVch(const int64_t& num)
     CScriptNum scriptnum(num);
     BOOST_CHECK(verify(bignum, scriptnum));
 
-    std::vector<unsigned char> vch = bignum.getvch();
-
     CScriptNum10 bignum2(bignum.getvch(), false);
-    vch = scriptnum.getvch();
     CScriptNum scriptnum2(scriptnum.getvch(), false);
     BOOST_CHECK(verify(bignum2, scriptnum2));
 
@@ -90,10 +87,9 @@ static void CheckSubtract(const int64_t& num1, const int64_t& num2)
     const CScriptNum10 bignum2(num2);
     const CScriptNum scriptnum1(num1);
     const CScriptNum scriptnum2(num2);
-    bool invalid = false;
 
     // int64_t overflow is undefined.
-    invalid = ((num2 > 0 && num1 < std::numeric_limits<int64_t>::min() + num2) ||
+    bool invalid = ((num2 > 0 && num1 < std::numeric_limits<int64_t>::min() + num2) ||
                     (num2 < 0 && num1 > std::numeric_limits<int64_t>::max() + num2));
     if (!invalid)
     {

src/test/sighash_tests.cpp

@@ -124,11 +124,9 @@ BOOST_AUTO_TEST_CASE(sighash_test)
     #if defined(PRINT_SIGHASH_JSON)
     std::cout << "[\n";
     std::cout << "\t[\"raw_transaction, script, input_index, hashType, signature_hash (result)\"],\n";
-    #endif
+    int nRandomTests = 500;
+    #else
     int nRandomTests = 50000;
-
-    #if defined(PRINT_SIGHASH_JSON)
-    nRandomTests = 500;
     #endif
     for (int i=0; i<nRandomTests; i++) {
         int nHashType = InsecureRand32();