Cleanup: various non functional changes

- Use const arguments.
- Quiet unused assignment warnings.
- Use explicit cast to suppress CPPCHECK's truncLongCastReturn warning.

intern/opensubdiv/internal/evaluator/eval_output.cc

@@ -7,12 +7,12 @@
 #include "internal/evaluator/eval_output.h"
 
 namespace blender::opensubdiv {
-bool is_adaptive(CpuPatchTable *patch_table)
+bool is_adaptive(const CpuPatchTable *patch_table)
 {
   return patch_table->GetPatchArrayBuffer()[0].GetDescriptor().IsAdaptive();
 }
 
-bool is_adaptive(GLPatchTable *patch_table)
+bool is_adaptive(const GLPatchTable *patch_table)
 {
   return patch_table->GetPatchArrays()[0].GetDescriptor().IsAdaptive();
 }

intern/opensubdiv/internal/evaluator/eval_output.h

@@ -161,8 +161,8 @@ class ConstPatchCoordWrapperBuffer : public RawDataWrapperVertexBuffer<const Pat
 
 // Discriminators used in FaceVaryingVolatileEval in order to detect whether we are using adaptive
 // patches as the CPU and OpenGL PatchTable have different APIs.
-bool is_adaptive(CpuPatchTable *patch_table);
-bool is_adaptive(GLPatchTable *patch_table);
+bool is_adaptive(const CpuPatchTable *patch_table);
+bool is_adaptive(const GLPatchTable *patch_table);
 
 template<typename EVAL_VERTEX_BUFFER,
          typename STENCIL_TABLE,