Remove the A_TO_OUTPUT option as it is not needed anymore and will not be implemented in favor of normal assignments.

src/config.c

@@ -158,8 +158,6 @@ void load_configuration(xcb_connection_t *conn, const char *override_configpath,
             assign = TAILQ_FIRST(&assignments);
             if (assign->type == A_TO_WORKSPACE)
                 FREE(assign->dest.workspace);
-            else if (assign->type == A_TO_OUTPUT)
-                FREE(assign->dest.output);
             else if (assign->type == A_COMMAND)
                 FREE(assign->dest.command);
             match_free(&(assign->match));