Following up on r1582370 which was a followup to r1577280, apply the same
usage of uninitialized variable fix to fsx.

* subversion/libsvn_fs_fs/lock.c
  (unlock_body): Properly initialize struct before using members from it.
    Without this patch info.fs_err will be read before setting a few lines
    later... and then the total struct copied in the array.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1582409 13f79535-47bb-0310-9956-ffa450edef68