Fix error: unused variable 'result'

[felixf4xu]

Hi,

When I build this project (with gcc 14) for this code:

memory/src/virtual_memory.cpp

Lines 48 to 52 in 016c9fb

	void foonathan::memory::virtual_memory_release(void* pages, std::size_t) noexcept
	{
	auto result = VirtualFree(pages, 0u, MEM_RELEASE);
	FOONATHAN_MEMORY_ASSERT_MSG(result, "cannot release pages");
	}

I had this error:

src/virtual_memory.cpp: In function 'void foonathan::memory::virtual_memory_release(void*, std::size_t)':
src/virtual_memory.cpp:50:10: error: unused variable 'result' [-Werror=unused-variable]
50 | auto result = VirtualFree(pages, 0u, MEM_RELEASE);
| ^~~~~~

it happens when FOONATHAN_MEMORY_DEBUG_ASSERT is not defined and then FOONATHAN_MEMORY_ASSERT_MSG is an empty macro and then result is not used.

This PR is to fix the compiling error.

Fix #183

[chinanewer]

The same problem also exists in another place, as shown below:

void foonathan::memory::virtual_memory_decommit(void* memory, std::size_t no_pages) noexcept
{
    auto result = VirtualFree(memory, no_pages * virtual_memory_page_size, MEM_DECOMMIT);
    FOONATHAN_MEMORY_ASSERT_MSG(result, "cannot decommit memory");
}

I fix on pull-189.

[foonathan]

Thanks for the PR, I went with the approach from #189. And sorry for the delay.