* subversion/libsvn_diff/diff_file.c
  (map_or_read_file): Do not rely on apr_mmap_create() behavior to 
   initialize output parameter on error and initialize it explicitly.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1513119 13f79535-47bb-0310-9956-ffa450edef68