fixed using uninitialised space params in gravity_props_init

examples/main.c

@@ -1315,11 +1315,12 @@ int main(int argc, char *argv[]) {
     /* Initialise the gravity properties */
     bzero(&gravity_properties, sizeof(struct gravity_props));
     if (with_self_gravity)
+      /* NOTE: In the zoom branch cdim is yet to be set by this point */
       gravity_props_init(&gravity_properties, params, &prog_const, &cosmo,
                          with_cosmology, with_external_gravity,
                          with_baryon_particles, with_DM_particles,
                          with_neutrinos, with_DM_background_particles, periodic,
-                         s.dim, s.cdim);
+                         dim, s.cdim);
 
     /* Initialize the space with these data. */
     if (myrank == 0) clocks_gettime(&tic);