drop empty get_backend calls

Author: kratsg

src/pyhf/infer/calculators.py

@@ -524,7 +524,6 @@ def expected_pvalues(self, sig_plus_bkg_distribution, bkg_only_distribution):
             :math:`\mathrm{CL}_{b}`, and :math:`\mathrm{CL}_{s}`.
         """
         # Calling pvalues is easier then repeating the CLs calculation here
-        _, _ = get_backend()
         return list(
             map(
                 list,

src/pyhf/optimize/opt_jax.py

@@ -45,7 +45,6 @@ def wrap_objective(objective, data, pdf, stitch_pars, do_grad=False, jit_pieces=
     Returns:
         objective_and_grad (:obj:`func`): tensor backend wrapped objective,gradient pair
     """
-    _, _ = get_backend()
     # NB: tuple arguments that need to be hashable (static_argnums)
     if do_grad: