RFR: 8283287: ClassLoader.c cleanups [v2]

[Alan Bateman]

On Thu, 17 Mar 2022 16:08:11 GMT, Tyler Steele <duke at openjdk.java.net> wrote:

>> As mentioned in the issue, I'd like to perform the following tidying on ClassLoader.c
>> 
>> - Alphabetize includes.
>> - Replace 'if (ptr == 0)' with 'if (ptr == NULL)'.
>> - Replace 'return 0' with 'return NULL'.
>
> Tyler Steele has updated the pull request incrementally with one additional commit since the last revision:
> 
>   removes unneeded errno.h

Marked as reviewed by alanb (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/7846