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/channel.c

@@ -4457,9 +4457,11 @@ channel_parse_messages(void)
 	    if (channel->ch_killing)
 	    {
 		channel_free_contents(channel);
+		channel_free_channel(channel);
 		channel->ch_job->jv_channel = NULL;
 	    }
-	    channel_free(channel);
+	    else
+		channel_free(channel);
 	    // channel has been freed, start over
 	    channel = first_channel;
 	    continue;

src/version.c

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