Fixed valgrind errors

db/db_test.cc

@@ -3232,7 +3232,7 @@ TEST(DBTest, MultiGetSimple) {
   keys[2] = "k3";
   keys[3] = "k4";
   keys[4] = "k5";
-  keys[6] = "no_key";
+  keys[5] = "no_key";
 
   std::vector<std::string> values(20,"Temporary data to be overwritten");
 

utilities/merge_operators/string_append/stringappend_test.cc

@@ -291,10 +291,9 @@ TEST(StringAppendOperatorTest,BIGRandomMixGetAppend) {
 TEST(StringAppendOperatorTest,PersistentVariousKeys) {
   DestroyDB(kDbName, Options());    // Start this test with a fresh DB
 
-  StringAppendOperator append_op('\n');
-
   // Perform the following operations in limited scope
   {
+    StringAppendOperator append_op('\n');
     auto db = OpenDb(&append_op);
     StringLists slists(db);
 
@@ -318,6 +317,7 @@ TEST(StringAppendOperatorTest,PersistentVariousKeys) {
 
   // Reopen the database (the previous changes should persist / be remembered)
   {
+    StringAppendOperator append_op('\n');
     auto db = OpenDb(&append_op);
     StringLists slists(db);