Fix potential unbounded memory usage in patch parser.
Fix potential unbounded memory usage in patch parser.

* subversion/libsvn_diff/parse-diff.c
  (hunk_readline_original_or_modified): Add LAST_POOL and use for allocations
   in loop body. Clear LAST_POOL on every iteration. It's not ITERPOOL because
   we use data allocated in LAST_POOL out of the loop body.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1705979 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion