avcodec/aacsbr: Remove unused parameter from sbr_gain_calc

Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/aacsbr.c

@@ -233,7 +233,7 @@ static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
  * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
  * and Calculation of gain (14496-3 sp04 p219)
  */
-static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
+static void sbr_gain_calc(SpectralBandReplication *sbr,
                           SBRData *ch_data, const int e_a[2])
 {
     int e, k, m;

libavcodec/aacsbr_fixed.c

@@ -394,7 +394,7 @@ static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
  * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
  * and Calculation of gain (14496-3 sp04 p219)
  */
-static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
+static void sbr_gain_calc(SpectralBandReplication *sbr,
                           SBRData *ch_data, const int e_a[2])
 {
     int e, k, m;

libavcodec/aacsbr_template.c

@@ -1513,7 +1513,7 @@ void AAC_RENAME(ff_sbr_apply)(AACContext *ac, SpectralBandReplication *sbr, int
             err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
             if (!err) {
                 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
-                sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
+                sbr_gain_calc(sbr, &sbr->data[ch], sbr->data[ch].e_a);
                 sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
                                 (const INTFLOAT (*)[40][2]) sbr->X_high,
                                 sbr, &sbr->data[ch],