Simplify code a bit.

* subversion/libsvn_diff/parse-diff.c
  (svn_diff_parse_next_patch): Rename return argument PATCH to PATCH_P 
   and add local variable PATCH to avoid dereference pointer every time.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1577085 13f79535-47bb-0310-9956-ffa450edef68