Eliminate half a function, 1 stat() and 1 file read.
Eliminate half a function, 1 stat() and 1 file read.

* subversion/libsvn_wc/adm_files.c
  (check_adm_exists): Eliminate half the function by trying
  and handling the result.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@866613 13f79535-47bb-0310-9956-ffa450edef68

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