patch 8.0.0707: freeing wrong memory with certain autocommands

Problem:    Freeing wrong memory when manipulating buffers in autocommands.
            (James McCoy)
Solution:   Also set the w_s pointer if w_buffer was NULL.
diff --git a/src/version.c b/src/version.c
index 33399a4..aaf7611 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    707,
+/**/
     706,
 /**/
     705,