Remove a few memsets in favor of initializers.
Remove a few memsets in favor of initializers.

* subversion/libsvn_diff/diff_file.c
  (find_identical_suffix, svn_diff_file_diff_2, svn_diff_file_diff3_2,
   svn_diff_file_diff4_2):
    Don't bother with a memset, when we can just initialize the structs to
    NULLs.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1070833 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion