Fix GetImgFingerprint for small files.

tools/symsrc/img_fingerprint.py

 #!/usr/bin/env python
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Retrieves an image's "fingerprint".
 
 This is used when retrieving the image from the symbol server.  The .dll (or cab
 compressed .dl_) or .exe is expected at a path like:
   foo.dll/FINGERPRINT/foo.dll
 """
 
 import sys
 import pefile
 
 
 def GetImgFingerprint(filename):
   """Returns the fingerprint for an image file"""
   pe = pefile.PE(filename)
-  return "%08X%06x" % (
+  return "%08X%x" % (
     pe.FILE_HEADER.TimeDateStamp, pe.OPTIONAL_HEADER.SizeOfImage)
 
 
 def main():
   if len(sys.argv) != 2:
     print "usage: file.dll"
     return 1
 
   print GetImgFingerprint(sys.argv[1])
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())