Convert NULL to nullptr

util/mac/launchd.h

 // 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,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #ifndef CRASHPAD_UTIL_MAC_LAUNCHD_H_
 #define CRASHPAD_UTIL_MAC_LAUNCHD_H_
 
 #include <CoreFoundation/CoreFoundation.h>
 #include <launch.h>
 
 namespace crashpad {
 
 //! \brief Converts a Core Foundation-type property list to a launchd-type
 //!     `launch_data_t`.
 //!
 //! \param[in] property_cf The Core Foundation-type property list to convert.
 //!
 //! \return The converted launchd-type `launch_data_t`. The caller takes
-//!     ownership of the returned value. On error, returns `NULL`.
+//!     ownership of the returned value. On error, returns `nullptr`.
 //!
 //! \note This function handles all `CFPropertyListRef` types except for
 //!     `CFDateRef`, because there’s no `launch_data_type_t` analogue. Not all
 //!     types supported in a launchd-type `launch_data_t` have
 //!     `CFPropertyListRef` analogues.
 launch_data_t CFPropertyToLaunchData(CFPropertyListRef property_cf);
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_MAC_LAUNCHD_H_