Convert NULL to nullptr

util/test/posix/close_multiple.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 84 matching lines @@
 
   int dir_fd = dirfd(dir);
   if (dir_fd == -1) {
     PLOG(WARNING) << "dirfd";
     return false;
   }
 
   dirent entry;
   dirent* result;
   int rv;
-  while ((rv = readdir_r(dir, &entry, &result)) == 0 && result != NULL) {
+  while ((rv = readdir_r(dir, &entry, &result)) == 0 && result != nullptr) {
     const char* entry_name = &(*result->d_name);
     if (strcmp(entry_name, ".") == 0 || strcmp(entry_name, "..") == 0) {
       continue;
     }
 
     char* end;
     long entry_fd_long = strtol(entry_name, &end, 10);
     if (entry_name[0] == '\0' || *end) {
       LOG(ERROR) << "unexpected entry " << entry_name;
       return false;
@@ skipping 32 matching lines @@
   max_fd = std::max(max_fd, getdtablesize());
 
   for (int entry_fd = fd; entry_fd < max_fd; ++entry_fd) {
     if (entry_fd != preserve_fd) {
       CloseNowOrOnExec(entry_fd, true);
     }
   }
 }
 
 }  // namespace crashpad