RFR: 8283287: ClassLoader.c cleanups [v4]

[Roger Riggs]

On Fri, 18 Mar 2022 15:13:17 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 offending whitespace

Marked as reviewed by rriggs (Reviewer).

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