Fix static analysis error

src/mlpack/methods/xgboost/loss_functions/sse_loss.hpp

@@ -55,7 +55,7 @@ class SSELoss
    * Returns the output value for the leaf in the tree.
    */
   template<typename MatType, typename WeightVecType>
-  double OutputLeafValue(const MatType& input,
+  double OutputLeafValue(const MatType& /* input */,
                          const WeightVecType& /* weights */)
   {
     return -ApplyL1(arma::accu(gradients)) / (arma::accu(hessians) + lambda);

src/mlpack/tests/xgboost_test.cpp

@@ -44,7 +44,7 @@ TEST_CASE("SSELeafValueTest", "[XGBTest]")
   double leafValue = -0.075;
 
   SSELoss Loss;
-  double gain = Loss.Evaluate<false>(input, weights);
+  double = Loss.Evaluate<false>(input, weights);
 
   REQUIRE(Loss.OutputLeafValue(input, weights) == leafValue);
 }