patch 8.1.0489: crash when autocmd clears vimpgrep location list

Problem:    Crash when autocmd clears vimpgrep location list.
Solution:   Return from qf_jump_edit_buffer() early. (Yegappan Lakshmanan)
diff --git a/src/version.c b/src/version.c
index 7618740..01dfc13 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    489,
+/**/
     488,
 /**/
     487,