patch 8.2.0442: channel contents might be used after being freed

Problem:    Channel contents might be used after being freed.
Solution:   Reset the job channel before freeing the channel.
diff --git a/src/version.c b/src/version.c
index 0cf6011..31c5610 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    442,
+/**/
     441,
 /**/
     440,