fix some non-critical warnings found by Coverity scan

lib/src/phy/common/test/sequence_test.c

@@ -177,7 +177,10 @@ int main(int argc, char** argv)
   }
 
   // Initialise sequence object
-  srslte_sequence_init(&sequence, max_length);
+  if (srslte_sequence_init(&sequence, max_length) != SRSLTE_SUCCESS) {
+    fprintf(stderr, "Error initializing sequence object\n");
+    return SRSLTE_ERROR;
+  }
 
   printf("%8s; %8s; %8s; %8s; %8s; %8s; %8s\n", "seed", "length", "GEN", "XOR PS", "XOR 16", "XOR 8", "Passed");
 

lib/src/phy/ue/test/ue_dl_nbiot_test.c

@@ -72,7 +72,7 @@ int dl_grant_with_sib1_test()
   }
 
   // pass MIB to compute SIB1 parameters
-  srslte_mib_nb_t mib;
+  srslte_mib_nb_t mib = {};
   mib.sched_info_sib1 = 3;
   // srslte_mib_nb_printf(stdout, cell, &mib);
   srslte_nbiot_ue_dl_set_mib(&ue_dl, mib);
@@ -108,7 +108,7 @@ int dl_grant_with_sib2_test()
   }
 
   // pass MIB to compute SIB1 parameters
-  srslte_mib_nb_t mib;
+  srslte_mib_nb_t mib = {};
   mib.sched_info_sib1 = 3;
   srslte_nbiot_ue_dl_set_mib(&ue_dl, mib);
 

lib/src/radio/test/benchmark_radio.cc

@@ -496,7 +496,7 @@ int main(int argc, char** argv)
 
   ret = SRSLTE_SUCCESS;
 
-  if (measure_delay) {
+  if (measure_delay && delay_count > 0) {
     for (uint32_t r = 1; r < nof_radios; r++) {
       printf("Radio %d is delayed %.1f samples from radio 0;\n", r, delay_idx[r] / delay_count);
     }