Convert NULL to nullptr

util/mac/mach_o_image_segment_reader.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 181 matching lines @@
   return vmsize() + (SegmentSlides() ? 0 : slide_);
 }
 
 const process_types::section* MachOImageSegmentReader::GetSectionByName(
     const std::string& section_name,
     mach_vm_address_t* address) const {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
 
   const auto& iterator = section_map_.find(section_name);
   if (iterator == section_map_.end()) {
-    return NULL;
+    return nullptr;
   }
 
   return GetSectionAtIndex(iterator->second, address);
 }
 
 const process_types::section* MachOImageSegmentReader::GetSectionAtIndex(
     size_t index,
     mach_vm_address_t* address) const {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
   CHECK_LT(index, sections_.size());
@@ skipping 53 matching lines @@
 }
 
 void MachOImageSegmentReader::SetSlide(mach_vm_size_t slide) {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
   INITIALIZATION_STATE_SET_INITIALIZING(initialized_slide_);
   slide_ = slide;
   INITIALIZATION_STATE_SET_VALID(initialized_slide_);
 }
 
 }  // namespace crashpad