refine log

src/server.c

@@ -1295,7 +1295,6 @@ int main(int argc, char **argv)
             break;
         case 'A':
             auth = 1;
-            LOGI("onetime authentication enabled");
             break;
         }
     }
@@ -1386,6 +1385,10 @@ int main(int argc, char **argv)
 #endif
     }
 
+    if (auth) {
+        LOGI("onetime authentication enabled");
+    }
+
 #ifdef __MINGW32__
     winsock_init();
 #else