feedback/GEAR/stellar_evolution.c:129:9: error: 'feedback_props' undeclared

GEAR cooling won't compile any more:

feedback/GEAR/stellar_evolution.c: In function 'stellar_evolution_compute_continuous_feedback_properties':
feedback/GEAR/stellar_evolution.c:129:9: error: 'feedback_props' undeclared (first use in this function)
  129 |     if (feedback_props->metallicity_max_first_stars == -1) {
      |         ^~~~~~~~~~~~~~
feedback/GEAR/stellar_evolution.c:129:9: note: each undeclared identifier is reported only once for each function it appears in
feedback/GEAR/stellar_evolution.c: In function 'stellar_evolution_compute_discrete_feedback_properties':
feedback/GEAR/stellar_evolution.c:233:9: error: 'feedback_props' undeclared (first use in this function)
  233 |     if (feedback_props->metallicity_max_first_stars == -1) {
      |         ^~~~~~~~~~~~~~

A quick search of the file shows that the feedback_props is indeed undeclared.