fix more variable-set-but-not-used warnings on gcc 4.6
diff --git a/test/nomalloc.cpp b/test/nomalloc.cpp
index 96ff16d..273b1f7 100644
--- a/test/nomalloc.cpp
+++ b/test/nomalloc.cpp
@@ -52,15 +52,7 @@
 
   MatrixType m1 = MatrixType::Random(rows, cols),
              m2 = MatrixType::Random(rows, cols),
-             m3(rows, cols),
-             mzero = MatrixType::Zero(rows, cols),
-             identity = Matrix<Scalar, MatrixType::RowsAtCompileTime, MatrixType::RowsAtCompileTime>
-                              ::Identity(rows, rows),
-             square = Matrix<Scalar, MatrixType::RowsAtCompileTime, MatrixType::RowsAtCompileTime>
-                              ::Random(rows, rows);
-  VectorType v1 = VectorType::Random(rows),
-             v2 = VectorType::Random(rows),
-             vzero = VectorType::Zero(rows);
+             m3(rows, cols);
 
   Scalar s1 = internal::random<Scalar>();