fix various uninit vars detected by cppcheck

non-critical fixes in tests mostly, still good to have those clean

lib/examples/usrp_capture_sync.c

@@ -122,11 +122,11 @@ int srslte_rf_recv_wrapper(void* h, cf_t* data[SRSLTE_MAX_PORTS], uint32_t nsamp
 int main(int argc, char** argv)
 {
   cf_t*             buffer[SRSLTE_MAX_CHANNELS] = {NULL};
-  int               n;
-  srslte_rf_t       rf;
-  srslte_filesink_t sink;
-  srslte_ue_sync_t  ue_sync;
-  srslte_cell_t     cell;
+  int               n                           = 0;
+  srslte_rf_t       rf                          = {};
+  srslte_filesink_t sink                        = {};
+  srslte_ue_sync_t  ue_sync                     = {};
+  srslte_cell_t     cell                        = {};
 
   signal(SIGINT, int_handler);
 

lib/src/phy/ch_estimation/chest_sl.c

@@ -120,7 +120,7 @@ static int chest_sl_psbch_gen(srslte_chest_sl_t* q)
     u[ns] = (f_gh + f_ss) % SRSLTE_SL_N_RU_SEQ;
   }
 
-  int32_t N_zc = 0; // N_zc - Zadoff Chu Sequence Length
+  int32_t N_zc = prime_numbers[0]; // N_zc - Zadoff Chu Sequence Length
   for (uint32_t i = NOF_PRIME_NUMBERS - 1; i > 0; i--) {
     if (prime_numbers[i] < q->M_sc_rs) {
       N_zc = prime_numbers[i];

lib/src/phy/phch/test/dci_nbiot_test.c

@@ -52,7 +52,7 @@ int dl_timing_test()
 
   cf_t                 rx_buff[SRSLTE_SF_LEN_PRB_NBIOT];
   cf_t*                buff_ptrs[SRSLTE_MAX_PORTS] = {rx_buff, NULL, NULL, NULL};
-  srslte_nbiot_ue_dl_t ue_dl;
+  srslte_nbiot_ue_dl_t ue_dl                       = {};
   if (srslte_nbiot_ue_dl_init(&ue_dl, buff_ptrs, SRSLTE_NBIOT_MAX_PRB, SRSLTE_NBIOT_NUM_RX_ANTENNAS)) {
     fprintf(stderr, "Error initializing UE DL\n");
     return SRSLTE_ERROR;
@@ -63,13 +63,13 @@ int dl_timing_test()
     return SRSLTE_ERROR;
   }
 
-  srslte_mib_nb_t mib;
+  srslte_mib_nb_t mib = {};
   mib.sched_info_sib1 = 2;
   srslte_nbiot_ue_dl_set_mib(&ue_dl, mib);
 
   // a dummy grant
   uint8_t          dci_bits_packed[] = {0x81, 0x00, 0x00};
-  srslte_dci_msg_t dci_tmp;
+  srslte_dci_msg_t dci_tmp           = {};
   dci_tmp.format   = SRSLTE_DCI_FORMATN1;
   dci_tmp.nof_bits = 23;
   srslte_bit_unpack_vector(dci_bits_packed, dci_tmp.payload, dci_tmp.nof_bits);