Fix: Crash On Exit When Using Vulkan

Vulkan device was deallocated, but when destroying the GHOST context
the GPU context is reactivated and want to allocate buffers lazilly.

This is solved by de-initializing the device on platform exit, resetting
buffer pointers so double free can be detected.

Pull Request: https://projects.blender.org/blender/blender/pulls/111462

source/blender/gpu/vulkan/vk_backend.cc

@@ -90,15 +90,14 @@ void VKBackend::detect_workarounds(VKDevice &device)
 void VKBackend::platform_exit()
 {
   GPG.clear();
-}
-
-void VKBackend::delete_resources()
-{
-  if (device_.is_initialized()) {
-    device_.deinit();
+  VKDevice &device = VKBackend::get().device_;
+  if (device.is_initialized()) {
+    device.deinit();
   }
 }
 
+void VKBackend::delete_resources() {}
+
 void VKBackend::samplers_update() {}
 
 void VKBackend::compute_dispatch(int groups_x_len, int groups_y_len, int groups_z_len)

source/blender/gpu/vulkan/vk_buffer.cc

@@ -14,7 +14,9 @@ namespace blender::gpu {
 
 VKBuffer::~VKBuffer()
 {
-  free();
+  if (is_allocated()) {
+    free();
+  }
 }
 
 bool VKBuffer::is_allocated() const
@@ -144,6 +146,8 @@ bool VKBuffer::free()
   const VKDevice &device = VKBackend::get().device_get();
   VmaAllocator allocator = device.mem_allocator_get();
   vmaDestroyBuffer(allocator, vk_buffer_, allocation_);
+  allocation_ = VK_NULL_HANDLE;
+  vk_buffer_ = VK_NULL_HANDLE;
   return true;
 }