Fix a small problem in the loggy upgrade process. Some v10 working copies have .svn/format, and some don't. The *intent* is to remove the file if present, so make the code match.
Fix a small problem in the loggy upgrade process. Some v10 working copies
have .svn/format, and some don't. The *intent* is to remove the file if
present, so make the code match.

* subversion/libsvn_wc/log.c:
  (log_do_upgrade_format): ignore errors from the file removal


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@876376 13f79535-47bb-0310-9956-ffa450edef68

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