RFR: 8315739: Missing null check in os::vm_min_address

[Daniel Jeliński]

On Wed, 6 Sep 2023 15:29:30 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

> Please review this fix for handling of file `/proc/sys/vm/mmap_min_addr` which does not exist on WSL1.
> 
> This fixes a crash if the file is absent, and a file handle leak (missing `fclose`) when the file is present.
> 
> Linux tier1 tests clean.

I'd appreciate a review; tiny change, shouldn't take long.

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PR Comment: https://git.openjdk.org/jdk/pull/15596#issuecomment-1713755198