free window_global in slab_automove_extstore.c

was leaking a small sub-struct when configuration reloaded.

Author: liwenlong05

slab_automove_extstore.c

@@ -80,6 +80,7 @@ void *slab_automove_extstore_init(struct settings *settings) {
 void slab_automove_extstore_free(void *arg) {
     slab_automove *a = (slab_automove *)arg;
     free(a->window_data);
+    free(a->window_global);
     free(a);
 }