Fix unused variable (introduced in

c248219)

Author: thomasjoerg

mlir/lib/Dialect/SparseTensor/Transforms/SparseTensorConversion.cpp

@@ -653,6 +653,7 @@ static void genDenseTensorIterationLoop(
     RankedTensorType tensorTp,
     function_ref<void(OpBuilder &, Location, ValueRange)> bodyBuilder) {
   auto enc = getSparseTensorEncoding(tensorTp);
+  (void) enc;
   assert(!enc && "Generating Densor Tensor Loop on a Sparse Tensor!");
 
   unsigned rank = tensorTp.getRank();