loader: Fix compiler warning
loader: Fix compiler warning

I had an unused variable left after some recent changes.

Change-Id: I934ea4a7410c6be9bbafe250bc09f38feb3d6f7c

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers