RFR: JDK-8300222: Replace NULL with nullptr in share/logging

[Johan Sjölen]

On Tue, 17 Jan 2023 14:17:00 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Do the conversion in the share/logging sub-directory and all of its files.
>
> src/hotspot/share/logging/logDecorations.cpp line 42:
> 
>> 40:     if (os::get_host_name(buffer, sizeof(buffer))) {
>> 41:       host_name = os::strdup_check_oom(buffer);
>> 42:       const char* old_value = Atomic::cmpxchg(&_host_name, (const char*)nullptr, host_name);
> 
> I wonder if you need this cast with nullptr ?

The nullptr argument is templated, so we do need the cast.

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PR: https://git.openjdk.org/jdk/pull/12014