psc_bnd_fields_impl: radiation=nullptr

Author: JamesMcClung

src/libpsc/psc_bnd_fields/psc_bnd_fields_impl.hxx

@@ -634,7 +634,7 @@ struct BndFields_ : BndFieldsBase
   Vec3<real_t> background_e = {0.0, 0.0, 0.0};
   Vec3<real_t> background_h = {0.0, 0.0, 0.0};
 
-  RadiatingBoundary<real_t>* radiation;
+  RadiatingBoundary<real_t>* radiation = nullptr;
 };
 
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