patch 9.0.0318: clearing screen causes flicker

Problem:    Clearing screen causes flicker.
Solution:   Do not clear but redraw in more cases.  Add () to "wait_return".
diff --git a/src/viminfo.c b/src/viminfo.c
index cd73413..acdf618 100644
--- a/src/viminfo.c
+++ b/src/viminfo.c
@@ -3095,7 +3095,7 @@
 	{
 	    int	tt = msg_didany;
 
-	    // avoid a wait_return for this message, it's annoying
+	    // avoid a wait_return() for this message, it's annoying
 	    semsg(_(e_viminfo_file_is_not_writable_str), fname);
 	    msg_didany = tt;
 	    fclose(fp_in);