Fixed unused variable error on clang
Fixed unused variable error on clang

Change-Id: Ifa00f970f4c16552e11d71e8bd1ab54d95065335

googlestadia/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,googlestadia/llpc