[PATCH 2 of 3] hgweb: replace file I/O with util.readfile

[Bryan O'Sullivan]

# HG changeset patch
# User Bryan O'Sullivan <bryano at fb.com>
# Date 1452643932 28800
#      Tue Jan 12 16:12:12 2016 -0800
# Node ID bdda0258d3884e81b9b80ca71669934d237be54c
# Parent  dc4b31f3489f5c7d574c8bf2e1f0d96a0564fd50
hgweb: replace file I/O with util.readfile

diff --git a/mercurial/hgweb/common.py b/mercurial/hgweb/common.py
--- a/mercurial/hgweb/common.py
+++ b/mercurial/hgweb/common.py
@@ -146,12 +146,8 @@ def staticfile(directory, fname, req):
         if os.path.exists(path):
             break
     try:
-        os.stat(path)
         ct = mimetypes.guess_type(path)[0] or "text/plain"
-        fp = open(path, 'rb')
-        data = fp.read()
-        fp.close()
-        req.respond(HTTP_OK, ct, body=data)
+        req.respond(HTTP_OK, ct, body=util.readfile(path))
     except TypeError:
         raise ErrorResponse(HTTP_SERVER_ERROR, 'illegal filename')
     except OSError as err: