RFR: 8362846: Windows error reporting for dll_load doesn't check for a null buffer

[Markus Grönlund]

On Tue, 22 Jul 2025 00:31:39 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Please review this simple fix for some missing null checks in `os::dll_load`. The primary issue handles Windows, while the additional is for Linux/BSD.
> 
> Testing:
> - new gtest
> - tiers 1-3
> 
> Thanks

Looks good.

-------------

Marked as reviewed by mgronlun (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26420#pullrequestreview-3043343582