Remove prach_ifft from premanent allocation

Allocate on the stack when necessary.

openair1/PHY/INIT/nr_init.c

@@ -190,8 +190,7 @@ void phy_init_nr_gNB(PHY_VARS_gNB *gNB)
   common_vars->debugBuff_sample_offset = 0; 
 
   // PRACH
-  prach_vars->rxsigF = (int16_t **)malloc16_clear(Prx*sizeof(int16_t*));
-  prach_vars->prach_ifft       = (int32_t *)malloc16_clear(1024*2*sizeof(int32_t));
+  prach_vars->rxsigF = (int16_t **)malloc16_clear(Prx * sizeof(int16_t *));
 
   init_prach_list(gNB);
 
@@ -266,10 +265,6 @@ void phy_free_nr_gNB(PHY_VARS_gNB *gNB)
 
   free_and_zero(common_vars->debugBuff);
 
-  NR_gNB_PRACH* prach_vars = &gNB->prach_vars;
-  free_and_zero(prach_vars->rxsigF);
-  free_and_zero(prach_vars->prach_ifft);
-
   for (int ULSCH_id = 0; ULSCH_id < gNB->max_nb_pusch; ULSCH_id++) {
     NR_gNB_PUSCH *pusch_vars = &gNB->pusch_vars[ULSCH_id];
     for (int i = 0; i < n_buf; i++) {

openair1/PHY/defs_gNB.h

@@ -151,8 +151,6 @@ typedef struct {
   /// second index: rx antenna [0..63] (hard coded) \note Hard coded array size indexed by \c nb_antennas_rx.
   /// third index: frequency-domain sample [0..ofdm_symbol_size*12[
   int16_t **rxsigF;
-  /// \brief local buffer to compute prach_ifft
-  int32_t *prach_ifft;
   gNB_PRACH_list_t list[NUMBER_OF_NR_PRACH_MAX];
 } NR_gNB_PRACH;