fix clang incomplete return type error (#97) #476

Job	Run time
linux: gcc, VulkanSDK 1.2.198, VMA=OFF	4m 5s
windows: msvc, windows-latest, VulkanSDK latest, VMA=ON	1m 24s
linux: gcc, VulkanSDK latest, VMA=ON	4m 34s
windows: msvc, windows-latest, VulkanSDK latest, VMA=OFF	1m 50s
windows: msvc, windows-2019, VulkanSDK latest, VMA=ON	2m 13s
linux: gcc, VulkanSDK latest, VMA=OFF	6m 30s
windows: msvc, windows-latest, VulkanSDK 1.3.243.0, VMA=ON	3m 8s
windows: msvc, windows-2019, VulkanSDK latest, VMA=OFF	2m 11s
linux: gcc, VulkanSDK 1.3.243, VMA=ON	4m 1s
windows: msvc, windows-latest, VulkanSDK 1.3.243.0, VMA=OFF	3m 7s
windows: msvc, windows-2019, VulkanSDK 1.3.243.0, VMA=ON	2m 11s
linux: gcc, VulkanSDK 1.3.243, VMA=OFF	5m 10s
windows: msvc, windows-latest, VulkanSDK 1.2.198.1, VMA=OFF	3m 7s
windows: msvc, windows-2019, VulkanSDK 1.3.243.0, VMA=OFF	2m 11s
windows: msvc, windows-2019, VulkanSDK 1.2.198.1, VMA=OFF	3m 38s
	49m 20s

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