Fixed segfault in pdsch_ue --help command

lib/examples/pdsch_ue.c

@@ -171,8 +171,8 @@ void usage(prog_args_t *args, char *prog) {
   printf("\t-S remote UDP address to send input signal [Default %s]\n", args->net_address_signal);
   printf("\t-u remote TCP port to send data (-1 does nothing with it) [Default %d]\n", args->net_port);
   printf("\t-U remote TCP address to send data [Default %s]\n", args->net_address);
-  printf("\t-M MBSFN area id [Default %s]\n", args->mbsfn_area_id);
-  printf("\t-N Non-MBSFN region [Default %s]\n", args->non_mbsfn_region);
+  printf("\t-M MBSFN area id [Default %d]\n", args->mbsfn_area_id);
+  printf("\t-N Non-MBSFN region [Default %d]\n", args->non_mbsfn_region);
   printf("\t-v [set srslte_verbose to debug, default none]\n");
 }