ui: Show mouse cursor when emu throws an exception. lr: fix vulkan init

core/rend/mainui.cpp

@@ -55,6 +55,7 @@ bool mainui_rend_frame()
 				if (!error.empty())
 				{
 					dc_stop();
+					EventManager::event(Event::Pause);
 					gui_stop_game(error);
 				}
 			}

shell/libretro/libretro.cpp

@@ -1394,7 +1394,7 @@ static void retro_vk_context_destroy()
 
 static bool set_vulkan_hw_render()
 {
-	retro_hw_render_callback hw_render;
+	retro_hw_render_callback hw_render{};
 	hw_render.context_type = RETRO_HW_CONTEXT_VULKAN;
 	hw_render.version_major = VK_API_VERSION_1_0;
 	hw_render.version_minor = 0;