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)
diff --git a/src/version.c b/src/version.c
index 6df87b4..738f31b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    435,
+/**/
     434,
 /**/
     433,