command: Fixed cmd_halt_timeout's gdb_outf() using %d for an unsign…

…ed int

src/command.c

@@ -443,7 +443,7 @@ static bool cmd_halt_timeout(target_s *t, int argc, const char **argv)
  (void)t;
  if (argc > 1)
  cortexm_wait_timeout = strtoul(argv[1], NULL, 0);
- gdb_outf("Cortex-M timeout to wait for device halts: %d\n", cortexm_wait_timeout);
+ gdb_outf("Cortex-M timeout to wait for device halts: %u\n", cortexm_wait_timeout);
  return true;
 }