layers: Only verify data ptr not report_data
layers: Only verify data ptr not report_data

report_data is only defined if DEBUG_REPORT is enabled,
so asserting that it must be non-null prevents things from
running for no reason.

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools