Misc: clang-cl warning clean-up

src/core/gpu_sw_backend.cpp

@@ -6,11 +6,7 @@
 
 #include "util/gpu_device.h"
 
-#include "common/assert.h"
-#include "common/log.h"
-
 #include <algorithm>
-Log_SetChannel(GPU_SW_Backend);
 
 GPU_SW_Backend::GPU_SW_Backend() : GPUBackend()
 {
@@ -209,6 +205,9 @@ void ALWAYS_INLINE_RELEASE GPU_SW_Backend::ShadePixel(const GPUBackendDrawComman
           color.bits = Truncate16((sum - carry) | (carry - (carry >> 5)));
         }
         break;
+
+        default:
+          break;
       }
 
       // See above.