[libFuzzer] Ensure that sqlite3_prepare_v2_fuzzer never writes to disk.

testing/libfuzzer/fuzzers/sqlite3_prepare_v2_fuzzer.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 #include <array>
 #include <string>
@@ skipping 24 matching lines @@
 
 // Entry point for LibFuzzer.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   if (size < 2)
     return 0;
 
   if (checkForBadKeyword(data, size))
     return 0;
 
   sqlite3* db;
-  if (SQLITE_OK != sqlite3_open(":memory:", &db))
+  int return_code = sqlite3_open_v2(
+      "db.db",
+      &db,
+      SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_MEMORY, 0);
+
+
+  if (SQLITE_OK != return_code)
     return 0;
 
   // Use first byte as random selector for other parameters.
   int selector = data[0];
 
   // To cover both cases when progress_handler is used and isn't used.
   if (selector & 1)
     sqlite3_progress_handler(db, 4, &Progress, NULL);
   else
     sqlite3_progress_handler(db, 0, NULL, NULL);
@@ skipping 10 matching lines @@
       if (sqlite3_step(statement) != SQLITE_ROW)
         break;
     }
 
     sqlite3_finalize(statement);
   }
 
   sqlite3_close(db);
   return 0;
 }