patch 9.0.0882: using freed memory after SpellFileMissing autocmd uses bwipe

Problem:    Using freed memory after SpellFileMissing autocmd uses bwipe.
Solution:   Bail out if the window no longer exists.
diff --git a/src/version.c b/src/version.c
index c5e7838..a35a172 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    882,
+/**/
     881,
 /**/
     880,