Merge pull request #1903 from AayushSabharwal/bugfix

Fix wrong variable name in `OptimizationProblemExpr`

Author: ChrisRackauckas

src/systems/optimization/optimizationsystem.jl

@@ -329,7 +329,7 @@ function OptimizationProblemExpr(sys::OptimizationSystem, args...; kwargs...)
     OptimizationProblemExpr{true}(sys::OptimizationSystem, args...; kwargs...)
 end
 
-function OptimizationProblemExpr{iip}(sys::OptimizationSystem, u0,
+function OptimizationProblemExpr{iip}(sys::OptimizationSystem, u0map,
                                       parammap = DiffEqBase.NullParameters();
                                       lb = nothing, ub = nothing,
                                       grad = false,