JuliaControl / ControlSystems.jl / 1320

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warning and typing in freqresp for statespace (#338)

* warning and typing in freqresp for statespace

* Remove type assertion

It did not occur for me anymore
```julia
julia> s = ss(tf(1, [1,1]))
StateSpace{Continuous,Float64,Array{Float64,2}}
A = 
 -1.0
B = 
 1.0
C = 
 1.0
D = 
 0.0

Continuous-time state-space model

julia> @code_warntype evalfr(s, 1im)
Variables
  #self#::Core.Compiler.Const(ControlSystems.evalfr, false)
  sys::StateSpace{Continuous,Float64,Array{Float64,2}}
  s::Complex{Int64}
  T::Type{Complex{Float64}}
  R::Array{Complex{Float64},2}
  value::Array{Complex{Float64},2}
  e::Any
  level::Base.CoreLogging.LogLevel
  std_level::Base.CoreLogging.LogLevel
  group::Symbol
  _module::Module
  logger::Union{Nothing, Base.CoreLogging.AbstractLogger}
  id::Symbol
  file::String
  line::Int64
  msg::String
  err::Any

Body::Array{Complex{Float64},2}
```

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