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/ex_cmds.c b/src/ex_cmds.c
index 9630252..d9f1c99 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -1151,7 +1151,8 @@
 #if defined(FEAT_EVAL)
 	if (!aborting())
 #endif
-	    (void)semsg(_(e_cant_create_file_str), itmp);	// will call wait_return
+	    // will call wait_return()
+	    (void)semsg(_(e_cant_create_file_str), itmp);
 	goto filterend;
     }
     if (curbuf != old_curbuf)
@@ -4331,7 +4332,7 @@
 							// needed
 			    msg_no_more = TRUE;
 			    // write message same highlighting as for
-			    // wait_return
+			    // wait_return()
 			    smsg_attr(HL_ATTR(HLF_R),
 				_("replace with %s (y/n/a/q/l/^E/^Y)?"), sub);
 			    msg_no_more = FALSE;