patch 8.0.1639: libvterm code lags behind master

Problem:    Libvterm code lags behind master.
Solution:   Sync to head, solve merge problems.
diff --git a/src/libvterm/bin/vterm-dump.c b/src/libvterm/bin/vterm-dump.c
index 84a957a..9d0edf4 100644
--- a/src/libvterm/bin/vterm-dump.c
+++ b/src/libvterm/bin/vterm-dump.c
@@ -227,5 +227,6 @@
 
   close(fd);
   vterm_free(vt);
+
   return 0;
 }