ra_serf: Simplify use of REQS_PER_CONN constant.
ra_serf: Simplify use of REQS_PER_CONN constant.

* subversion/libsvn_ra_serf/update.c
  (open_connection_if_needed): Define REQS_PER_CONN as 8 directly instead of
   using power of two math.



git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@873625 13f79535-47bb-0310-9956-ffa450edef68

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