fixed coverty bug

srslte/lib/phch/test/prach_test_usrp.c

@@ -173,11 +173,16 @@ int main(int argc, char **argv) {
   srslte_rf_set_rx_freq(&rf, uhd_freq);
   srslte_rf_set_tx_freq(&rf, uhd_freq);
   
+  if (srate > 1e6) {
     if (30720%((int) srate/1000) == 0) {
       srslte_rf_set_master_clock_rate(&rf, 30.72e6);        
     } else {
       srslte_rf_set_master_clock_rate(&rf, 23.04e6);        
     }
+  } else {
+    printf("Invalid sampling rate %d Hz\n", srate);
+    exit(-1);
+  }
   printf("Setting sampling rate %.2f MHz\n", (float) srate/1000000);
   float srate_rf = srslte_rf_set_rx_srate(&rf, (double) srate);
   if (srate_rf != srate) {