patch 8.2.5170: tiny issues

Problem:    Tiny issues.
Solution:   Tiny improvements.
diff --git a/src/screen.c b/src/screen.c
index a5b77e2..82a0e91 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -4133,7 +4133,7 @@
 skip_showmode()
 {
     // Call char_avail() only when we are going to show something, because it
-    // takes a bit of time.  redrawing() may also call char_avail_avail().
+    // takes a bit of time.  redrawing() may also call char_avail().
     if (global_busy
 	    || msg_silent != 0
 	    || !redrawing()