Wald test of exogenity

I get this result after IVprobit model using Newey's two step estimation.

Wald test of exogeneity: chi2(1) = 0.32 Prob > chi2 = 0.5716

I don't know how to interpret these results. does this means that my independent variable was endogenious and i have done right by applying instrumental variable? Or there is no need of instrumental variable as my independent variable is exogenious ?