patch 8.2.3572: memory leak when closing window and using "multispace"

Problem:    Memory leak when closing window and using "multispace" in
            'listchars'.
Solution:   Free the memory. (closes #9071)
diff --git a/src/version.c b/src/version.c
index 43e8615..b7f64c7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3572,
+/**/
     3571,
 /**/
     3570,