patch 8.0.0377: possible overflow when reading corrupted undo file

Problem:    Possible overflow when reading corrupted undo file.
Solution:   Check if allocated size is not too big. (King)
diff --git a/src/version.c b/src/version.c
index 8d14541..c79020b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    377,
+/**/
     376,
 /**/
     375,