Fix a bug found by Ivan.
Fix a bug found by Ivan.

* subversion/libsvn_ra_serf/util.c:
  (write_to_pending): after writing content to the disk, we need to exit
    to avoid also writing to memory.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion