Stop program crashing after an illegal argument is passed. It doesn't…

… check properly for arguments though.

shairport.c

@@ -212,7 +212,6 @@ int parse_options(int argc, char **argv) {
  long_options, NULL)) > 0) {
  switch (opt) { 
  // Note -- Version, Kill, Pause and Help done separately
- default:
  case 't':
  config.timeout = atoi(optarg);
  break;
@@ -265,9 +264,16 @@ int parse_options(int argc, char **argv) {
  case 'w':
  config.cmd_blocking = 1;
  break;
- case 'm':
+  case 'm':
  config.mdns_name = optarg;
  break;
+ case '?':
+ /* getopt_long already printed an error message. */
+ exit(1);
+ break; // unnecessary
+ default:
+ die("Unexpected option character."); 
+ break; //unnecessary 
  }
  }
  return optind;