Fix missing deallocate on tmpn.

src/serial/psb_dneigh.f90

@@ -52,6 +52,7 @@ subroutine psb_dneigh(a,idx,neigh,n,info,lev)
            n=n+nn
         end if
      end do
+     deallocate(tmpn)
   end if
   
   call psb_erractionrestore(err_act)