Fix some errors with previous commits

lib/dmon/dmon_extra.h

@@ -139,7 +139,6 @@ DMON_API_IMPL bool dmon_watch_rm(dmon_watch_id id, const char* watchdir)
         }
     }
     if (i >= c) {
-        *error_code = DMON_ERROR_SUBDIR_LOCATION;
         if (!skip_lock)
             pthread_mutex_unlock(&_dmon.mutex);
         return false;

src/api/system.c

@@ -754,7 +754,7 @@ static int f_watch_dir_add(lua_State *L) {
   watch_id.id = luaL_checkinteger(L, 1);
   const char *subdir = luaL_checkstring(L, 2);
   dmon_error error_code;
-  int success = dmon_watch_add(watch_id, subdir, &error_code)
+  int success = dmon_watch_add(watch_id, subdir, &error_code);
   if (!success) {
     lua_pushboolean(L, 0);
     lua_pushstring(L, dmon_error_str(error_code));