fix typo

src/GeneralizedSchurDecompositionSolver.jl

@@ -59,7 +59,7 @@ function gs_solver!(ws::GsSolverWs,d::Matrix{Float64},e::Matrix{Float64},n1::Int
     try
         dgges!('N', 'V', e, d, zeros(1,1), ws.vsr, ws.eigval, ws.dgges_ws)
     catch e
-        if e.error_nbr = size(e,1) + 2
+        if e.error_nbr == size(e,1) + 2
             println("Warning: DGGES reports error $(e.error_nbr")
         else
             rethrow(e)