patch 8.2.4241: some type casts are redundant

Problem:    Some type casts are redundant.
Solution:   Remove the type casts. (closes #9643)
diff --git a/src/channel.c b/src/channel.c
index 0b8bfb3..68f1177 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -816,7 +816,7 @@
 	    ch_log(channel,
 		      "Waiting for connection (waiting %d msec)...", waitnow);
 
-	    ret = select((int)sd + 1, &rfds, &wfds, NULL, &tv);
+	    ret = select(sd + 1, &rfds, &wfds, NULL, &tv);
 	    if (ret < 0)
 	    {
 		SOCK_ERRNO;