loader: Eliminate warning for uninitialized value.
loader: Eliminate warning for uninitialized value.

Added default value to severity to kill a Linux warning.

Change-Id: Iaf3e62a0fa01d74874aaec4951f9a2aa38479ca0

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