Integrated: 8338019: Fix simple -Wzero-as-null-pointer-constant warnings in riscv code

[Gui Cao]

On Thu, 8 Aug 2024 03:37:06 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Hi, 
> Same as  [JDK-8337786](https://bugs.openjdk.org/browse/JDK-8337786) for aarch64, similar build warnings exist on riscv. Please help review this trivial change that replaces some uses of literal 0 as a null pointer constant in riscv code to instead use nullptr.
> 
> ### Testing
> - [x] Run tier1 tests on SOPHON SG2042 (release)

This pull request has now been integrated.

Changeset: 0c1e9111
Author:    Gui Cao <gcao at openjdk.org>
Committer: Fei Yang <fyang at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/0c1e9111d226b601236b9826e27ecc67a8b625fb
Stats:     5 lines in 4 files changed: 0 ins; 0 del; 5 mod

8338019: Fix simple -Wzero-as-null-pointer-constant warnings in riscv code

Reviewed-by: fyang, mli, luhenry

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PR: https://git.openjdk.org/jdk/pull/20506