Convert NULL to nullptr

util/mach/mach_message_server.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 102 matching lines @@
       (options & MACH_SEND_TRAILER) ? (max_reply_size + MAX_TRAILER_SIZE)
                                     : max_reply_size);
 
   kern_return_t kr;
 
   do {
     mach_msg_size_t this_request_alloc = request_alloc;
     mach_msg_size_t this_request_size = request_size;
 
     base::mac::ScopedMachVM request_scoper;
-    mach_msg_header_t* request_header = NULL;
+    mach_msg_header_t* request_header = nullptr;
 
     while (!request_scoper.address()) {
       vm_address_t request_addr;
       kr = vm_allocate(mach_task_self(),
                        &request_addr,
                        this_request_alloc,
                        VM_FLAGS_ANYWHERE | VM_MAKE_TAG(VM_MEMORY_MACH_MSG));
       if (kr != KERN_SUCCESS) {
         return kr;
       }
@@ skipping 123 matching lines @@
         // persistent mode, and just return success when not in persistent mode.
         return (persistent == kPersistent) ? MACH_RCV_TIMED_OUT : kr;
       }
     }
   } while (persistent == kPersistent);
 
   return kr;
 }
 
 }  // namespace crashpad