fix memory leak

src/codec2_pitch.c

@@ -113,6 +113,7 @@ int codec2_pitch_est(CODEC2_PITCH *pitch, float Sn[], float *f0, float *voicing)
 
 void codec2_pitch_destroy(CODEC2_PITCH *pitch)
 {
+    free(pitch->fft_fwd_cfg);
     nlp_destroy(pitch->nlp_states);
     free(pitch->w);
     free(pitch);

src/freq.c

@@ -140,6 +140,10 @@ static void check_init() {
   common.init = 1;
 }
 
+void freq_close() {
+    opus_fft_free(common.kfft,0);
+}
+
 void dct(float *out, const float *in) {
   int i;
   check_init();

src/freq.h

@@ -42,6 +42,7 @@
 
 #define NB_BANDS 18
 
+void freq_close(void);
 void compute_band_energy(float *bandE, const kiss_fft_cpx *X);
 void compute_band_corr(float *bandE, const kiss_fft_cpx *X, const kiss_fft_cpx *P);
 

src/lpcnet_dump.c

@@ -87,7 +87,8 @@ static DenoiseState *rnnoise_create() {
 }
 
 static void rnnoise_destroy(DenoiseState *st) {
-  free(st);
+    freq_close();
+    free(st);
 }
 
 static short float2short(float x)