patch 8.2.4399: crash after ml_get error

Problem:    Crash after ml_get error.
Solution:   When returning "???" flush the line and set ml_line_lnum.
diff --git a/src/version.c b/src/version.c
index 4bfca87..4f17acf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4399,
+/**/
     4398,
 /**/
     4397,