Fix some code which causes warnings when compiled by /analyze tool

core/fpdfapi/fpdf_parser/fpdf_parser_decode_embeddertest.cpp

 // Copyright 2015 PDFium 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 "core/fpdfapi/fpdf_parser/include/fpdf_parser_decode.h"
 
 #include <cstring>
 #include <string>
 
 #include "core/fxcrt/include/fx_basic.h"
@@ skipping 55 matching lines @@
           "\x80\x30\x8a\xd2\xb9\xf4\xdd\x0d\x14\xd2\x8b\xc1\x46\x99\x59\x1a"
           "\x2b\x58\x1a\x9a\x83\x8c\x49\xe3\x0a\x04\x42\x00\x37\x4c\x1b\x42",
           "1 0 0 -1 29 763 cm\n0 0 555 735 re\nW n\nq\n0 0 555 734.394 re\n"
           "W n\nq\n0.8009 0 0 0.8009 0 0 cm\n1 1 1 RG 1 1 1 rg\n/G0 gs\n"
           "0 0 693 917 re\nf\nQ\nQ\n",
           96),
   };
 
   for (size_t i = 0; i < FX_ArraySize(flate_decode_cases); ++i) {
     const pdfium::DecodeTestData& data = flate_decode_cases[i];
-    unsigned char* result;
+    unsigned char* result = nullptr;
     unsigned int result_size;
     EXPECT_EQ(data.processed_size,
               FlateDecode(data.input, data.input_size, result, result_size))
         << " for case " << i;
     ASSERT_TRUE(result);
     EXPECT_EQ(std::string((const char*)data.expected, data.expected_size),
               std::string((const char*)result, result_size))
         << " for case " << i;
     FX_Free(result);
   }
@@ skipping 21 matching lines @@
 
 TEST_F(FPDFParserDecodeEmbeddertest, Bug_455199) {
   // Tests object numbers with a value > 01000000.
   // Should open successfully.
   EXPECT_TRUE(OpenDocument("bug_455199.pdf"));
   FPDF_PAGE page = LoadPage(0);
   FPDF_BITMAP bitmap = RenderPage(page);
   FPDFBitmap_Destroy(bitmap);
   UnloadPage(page);
 }