rsx: Misc fixes

[kd-11]

https://godbolt.org/z/4745MGT6z

[digant73]

in #17088 you fixed some double releases (due to commit c7d9ec5) causing issues when trying to fix #17086 but I see at the end you also removed some checks on pointer validity such as the following in VKGSRender.cpp:

if (m_vertex_layout_storage)
{
	vk::get_gc()->dispose(m_vertex_layout_storage);
}

Shouldn't you check the validity of the reference at the beginning of the new used vk::get_resource_manager()->dispose() method? something like:

if (!object)
{
	return;
}

[kd-11]

in #17088 you fixed some double releases (due to commit c7d9ec5) causing issues when trying to fix #17086 but I see at the end you also removed some checks on pointer validity such as the following in VKGSRender.cpp:

if (m_vertex_layout_storage)
{
	vk::get_gc()->dispose(m_vertex_layout_storage);
}

Shouldn't you check the validity of the reference at the beginning of the new used vk::get_resource_manager()->dispose() method? something like:

if (!object)
{
	return;
}

This is handled downstream in disposable_t dtor. It is intentional, gc runs on a separate thread so we let any logic run checks from that side.