Code simplification.
Code simplification.

* /home/julianfoad/src/subversion-d/subversion/libsvn_ra_serf/commit.c
  (derive_old_val): Remove a level of indirection, type casts and memory
    allocations. Add an output flag instead. Add a doc string.
  (proppatch_walker): Update accordingly.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1102060 13f79535-47bb-0310-9956-ffa450edef68

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