Convert NULL to nullptr

util/posix/process_util_mac.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 25 matching lines @@
   // 1 bytes, expecting to only receive args_size_estimate. If it gets the extra
   // byte, it indicates that the string area has grown, and the sysctl() pair
   // will be retried a limited number of times.
 
   size_t args_size_estimate;
   size_t args_size;
   std::string args;
   int tries = 3;
   do {
     int mib[] = {CTL_KERN, KERN_PROCARGS2, pid};
-    int rv = sysctl(mib, arraysize(mib), NULL, &args_size_estimate, NULL, 0);
+    int rv =
+        sysctl(mib, arraysize(mib), nullptr, &args_size_estimate, nullptr, 0);
     if (rv != 0) {
       return false;
     }
 
     args_size = args_size_estimate + 1;
     args.resize(args_size);
-    rv = sysctl(mib, arraysize(mib), &args[0], &args_size, NULL, 0);
+    rv = sysctl(mib, arraysize(mib), &args[0], &args_size, nullptr, 0);
     if (rv != 0) {
       return false;
     }
   } while (args_size == args_size_estimate + 1 && tries--);
 
   if (args_size == args_size_estimate + 1) {
     return false;
   }
 
   // KERN_PROCARGS2 needs to at least contain argc.
@@ skipping 29 matching lines @@
   if (argc >= 0) {
     // Not every argument was recovered.
     return false;
   }
 
   argv->swap(local_argv);
   return true;
 }
 
 }  // namespace crashpad