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)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    377,
 /**/
     376,
 /**/