Fix two memory leaks from pdfium_unittests

core/src/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.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/include/fpdfapi/fpdf_parser.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(fpdf_parser_decode, HexDecode) {
   {
     // Empty src string.
     uint8_t* dest = nullptr;
     FX_DWORD dest_size;
     uint8_t src[] = "";
     EXPECT_EQ(0, HexDecode(src, 0, dest, dest_size));
     EXPECT_EQ(0, dest_size);
     EXPECT_EQ('\0', dest[0]);
+    FX_Free(dest);
   }
 
   {
     // Regular conversion.
     uint8_t* dest = nullptr;
     FX_DWORD dest_size;
     uint8_t src[] = "12Ac>zzz";
     EXPECT_EQ(5, HexDecode(src, 8, dest, dest_size));
     EXPECT_EQ(2, dest_size);
     EXPECT_EQ(18, dest[0]);
     EXPECT_EQ(172, dest[1]);
+    FX_Free(dest);
   }
 
   {
     // Non-multiple length.
     uint8_t* dest = nullptr;
     FX_DWORD dest_size;
     uint8_t src[] = "12A>zzz";
     EXPECT_EQ(4, HexDecode(src, 8, dest, dest_size));
     EXPECT_EQ(2, dest_size);
     EXPECT_EQ(18, dest[0]);
     EXPECT_EQ(160, dest[1]);
+    FX_Free(dest);
   }
 
   {
     // Skips unknown characters.
     uint8_t* dest = nullptr;
     FX_DWORD dest_size;
     uint8_t src[] = "12tk  \tAc>zzz";
     EXPECT_EQ(10, HexDecode(src, 13, dest, dest_size));
     EXPECT_EQ(2, dest_size);
     EXPECT_EQ(18, dest[0]);
     EXPECT_EQ(172, dest[1]);
+    FX_Free(dest);
   }
 }