Default the number of log message children to zero if the value isn't provided over ra_svn.
Default the number of log message children to zero if the value isn't provided
over ra_svn.

* subversion/libsvn_ra_svn/client.c
  (ra_svn_log): Check for an unspecified number, and default nbr_children to
  zero if so.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@866063 13f79535-47bb-0310-9956-ffa450edef68

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