On the fsx-1.10 branch: Follow-up to r1662931.
On the fsx-1.10 branch: Follow-up to r1662931.

* subversion/libsvn_fs_x/cached_data.c
  (read_delta_window): Wait for the revision file object to be constructed
                       before accessing it.

git-svn-id: 40002ad72c45bcd78a61b73a7ab5afec77c4e304@1662937 13f79535-47bb-0310-9956-ffa450edef68

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