[in tools/buildbot/slaves/svn-x64-macosx]

* mkramdisk.sh, rmramdisk.sh: Explicitly set the exit code to 0 so that
   the caller doesn't fail because of a failed match from fgrep.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1638704 13f79535-47bb-0310-9956-ffa450edef68