Convert NULL to nullptr

util/test/multiprocess_exec.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 43 matching lines @@
 
   // Build up the argv vector. This is done in PreFork() instead of
   // MultiprocessChild() because although the result is only needed in the child
   // process, building it is a hazardous operation in that process.
   ASSERT_TRUE(argv_.empty());
 
   argv_.push_back(command_.c_str());
   for (const std::string& argument : arguments_) {
     argv_.push_back(argument.c_str());
   }
-  argv_.push_back(NULL);
+  argv_.push_back(nullptr);
 }
 
 void MultiprocessExec::MultiprocessChild() {
   // Make sure that stdin, stdout, and stderr are FDs 0, 1, and 2, respectively.
   // All FDs above this will be closed.
   static_assert(STDIN_FILENO == 0, "stdin must be fd 0");
   static_assert(STDOUT_FILENO == 1, "stdout must be fd 1");
   static_assert(STDERR_FILENO == 2, "stderr must be fd 2");
 
   // Move the read pipe to stdin.
@@ skipping 56 matching lines @@
   IGNORE_EINTR(close(STDOUT_FILENO));
   HANDLE_EINTR(dup2(dup_orig_stdout_fd, STDOUT_FILENO));
   IGNORE_EINTR(close(dup_orig_stdout_fd));
 
   forbid_return.Disarm();
   FAIL() << ErrnoMessage("execv") << ": " << argv_[0];
 }
 
 }  // namespace test
 }  // namespace crashpad