fix race cond in mbms startup procedure

executables/lte-softmodem.c

@@ -598,10 +598,11 @@ int main ( int argc, char **argv )
     sync_var=0;
     pthread_cond_broadcast(&sync_cond);
     pthread_mutex_unlock(&sync_mutex);
-    config_check_unknown_cmdlineopt(CONFIG_CHECKALLSECTIONS);
   }
 
   create_tasks_mbms(1);
+  sleep(1);
+  config_check_unknown_cmdlineopt(CONFIG_CHECKALLSECTIONS);
 
   // wait for end of program
   LOG_UI(ENB_APP,"TYPE <CTRL-C> TO TERMINATE\n");