don't init linsolve

Author: oscardssmith

lib/OrdinaryDiffEqDifferentiation/src/linsolve_utils.jl

@@ -38,9 +38,6 @@ function dolinsolve(integrator, linsolve; A = nothing, linu = nothing, b = nothi
 end
 
 function wrapprecs(linsolver, W, weight)
-    if isnothing(linsolver)
-        linsolver = LinearSolve.LUFactorization()
-    end
     if hasproperty(linsolver, :precs) && isnothing(linsolver.precs)
         Pl = LinearSolve.InvPreconditioner(Diagonal(_vec(weight)))
         Pr = Diagonal(_vec(weight))