remove a useless line in op_lr_diag

Author: maki49

source/module_lr/operator_casida/operator_lr_diag.h

@@ -46,9 +46,8 @@ namespace LR
             const bool is_first_node = false)const override
         {
             ModuleBase::TITLE("OperatorLRDiag", "act");
-            const int nlocal_ph = nk * pX.get_local_size();   // local size of particle-hole basis
             hsolver::vector_mul_vector_op<T, Device>()(this->ctx,
-                nk * pX.get_local_size(),
+                nk * pX.get_local_size(),   // local size of particle-hole basis
                 hpsi,
                 psi_in,
                 this->eig_ks_diff.c);