Free buf before exiting in case of unknown option while parsing the args in the command line

ui/main.cpp

@@ -211,7 +211,7 @@ void config_usage(const char *progname)
    "Usage: %s [options]\n\n"
       "Options:\n"
       "   -h --help          this help\n"
-      "   -c --card N        select the hw:N card"
+      "   -c --card N        select the hw:N card\n"
       "   -D --device        select the device, default 'default'\n"
       "   -s --systray       run in the systray\n"
       "   -x --xpos          x position\n"
@@ -347,15 +347,18 @@ int main(int argc, char *argv[])
             break;
         case 'h':
             config_usage(progname.c_str());
-            break;
+            free(buf);
+            return 0;
         case '?':
             if (isprint (optopt))
                fprintf (stderr, "Unknown option `-%c'.\n", optopt);
             else
                fprintf (stderr, "Unknown option character `\\x%x'.\n",
               optopt);
+            free(buf);
             return 1;
         default:
+            free(buf);
             abort ();
             
         } // switch