While checking out the behavior of the code, apply some modern layout.

* subversion/libsvn_diff/diff_file.c
  (datasources_open): Avoid warning with suffix scanning disabled.
  (svn_diff_file_output_unified3): Don't initialize unneeded data. Remove
    'direct child' requirement as any descendant will do. No space before
    parren.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1436892 13f79535-47bb-0310-9956-ffa450edef68