apply suggestions in R2N & R2DH

Author: MaxenceGollier

src/R2DH.jl

@@ -150,7 +150,7 @@ Notably, you can access, and modify, the following:
   - `stats.status`: current status of the algorithm. Should be `:unknown` unless the algorithm has attained a stopping criterion. Changing this to anything will stop the algorithm, but you should use `:user` to properly indicate the intention.
   - `stats.elapsed_time`: elapsed time in seconds.
 """
-function R2DH(nlp::AbstractNLPModel{T, V}, h, options::ROSolverOptions{T}; kwargs...) where {T, V}
+function R2DH(nlp::AbstractDiagonalQNModel{T, V}, h, options::ROSolverOptions{T}; kwargs...) where {T, V}
   kwargs_dict = Dict(kwargs...)
   selected = pop!(kwargs_dict, :selected, 1:(nlp.meta.nvar))
   x0 = pop!(kwargs_dict, :x0, nlp.meta.x0)

src/R2N.jl

@@ -44,7 +44,6 @@ function R2NSolver(
   xkn = similar(x0)
   s = similar(x0)
   s1 = similar(x0)
-  v = similar(x0)
   has_bnds = any(l_bound .!= T(-Inf)) || any(u_bound .!= T(Inf))
   if has_bnds
     l_bound_m_x = similar(xk)