On the log-addressing branch:  Simplify with no functional change.

* subversion/libsvn_fs_fs/transaction.c
  (commit_body): simplify code on the pre-f7 compat path

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/log-addressing@1531986 13f79535-47bb-0310-9956-ffa450edef68