Fix memory leak on MacOS platforms.
Fix memory leak on MacOS platforms.

* subversion/libsvn_subr/sysinfo.c
  (system_version_plist): Release the CFMutableDataRef if returning early.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1646620 13f79535-47bb-0310-9956-ffa450edef68

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