Convert NULL to nullptr

minidump/minidump_string_writer_test.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 115 matching lines @@
     // least one U+FFFD replacement character was written.
     ASSERT_GE(file_writer.string().size(),
               sizeof(MINIDUMP_STRING) + 2 * sizeof(MINIDUMP_STRING::Buffer[0]));
     const MINIDUMP_STRING* minidump_string = MinidumpStringCast(file_writer);
     EXPECT_EQ(file_writer.string().size() - sizeof(MINIDUMP_STRING) -
                   sizeof(MINIDUMP_STRING::Buffer[0]),
               minidump_string->Length);
     size_t out_units =
         minidump_string->Length / sizeof(minidump_string->Buffer[0]);
     EXPECT_EQ(0, minidump_string->Buffer[out_units]);
-    EXPECT_NE(reinterpret_cast<char16*>(NULL),
+    EXPECT_NE(nullptr,
               base::c16memchr(minidump_string->Buffer, 0xfffd, out_units));
   }
 }
 
 const MinidumpUTF8String* MinidumpUTF8StringCast(
     const StringFileWriter& file_writer) {
   return reinterpret_cast<const MinidumpUTF8String*>(&file_writer.string()[0]);
 }
 
 TEST(MinidumpStringWriter, MinidumpUTF8StringWriter) {
@@ skipping 47 matching lines @@
     EXPECT_EQ(0,
               memcmp(kTestData[index].string,
                      minidump_string->Buffer,
                      expected_utf8_bytes_with_nul));
   }
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace crashpad