a question about clone_mnt in namespace.c

Hi dear all,
I have a question about the mnt_master logic in clone_mnt , look at
following lines:
...
} else if (!(flag & CL_PRIVATE)) {
  if ((flag & CL_MAKE_SHARED) || IS_MNT_SHARED(old))
	list_add(&mnt->mnt_share, &old->mnt_share);
  if (IS_MNT_SLAVE(old))
	list_add(&mnt->mnt_slave, &old->mnt_slave);
    mnt->mnt_master = old->mnt_master;
}
...
I think the following lines are equivalent, right ? or I've missed
something ? many thanks!
...
} else if (!(flag & CL_PRIVATE)) {
  if ((flag & CL_MAKE_SHARED) || IS_MNT_SHARED(old))
	list_add(&mnt->mnt_share, &old->mnt_share);
  if (IS_MNT_SLAVE(old)) {
	list_add(&mnt->mnt_slave, &old->mnt_slave);
        mnt->mnt_master = old->mnt_master;
  }
}
...
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