patch 8.2.0435: channel contents might be freed twice

Problem:    Channel contents might be freed twice.
Solution:   Call either channel_free_channel() or channel_free(), not both.
            (Nobuhiro Takasaki, closes #5835)

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    435,
 /**/
     434,
 /**/