[PATCH STABLE] transaction: fix file descriptor leak for journal.backupfiles

[Durham Goode]

# HG changeset patch
# User Durham Goode <durham at fb.com>
# Date 1398897398 25200
#      Wed Apr 30 15:36:38 2014 -0700
# Branch stable
# Node ID b57531f5e247c777c58a6864c28050ce212dcf3a
# Parent  e2031c8ca4f8939a21fea454cb64b7a2744d9c8d
transaction: fix file descriptor leak for journal.backupfiles

The journal.backupfiles descriptor wasn't being closed. This resulted in
hgsubversion test runs having a bagillion descriptors open, which crashed on
platforms with low open file limits (like OSX).

diff --git a/mercurial/transaction.py b/mercurial/transaction.py
--- a/mercurial/transaction.py
+++ b/mercurial/transaction.py
@@ -220,6 +220,7 @@
         if self.count != 0:
             return
         self.file.close()
+        self.backupsfile.close()
         self.entries = []
         if self.after:
             self.after()
@@ -243,6 +244,7 @@
         self.count = 0
         self.usages = 0
         self.file.close()
+        self.backupsfile.close()
 
         if self.onabort is not None:
             self.onabort()