[Bug 251694] Spurious EBUSY after zfs receiving properties to an existing dataset

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251694

            Bug ID: 251694
           Summary: Spurious EBUSY after zfs receiving properties to an
                    existing dataset
           Product: Base System
           Version: 12.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

If you do a "zfs send -p <src> | zfs receive -F <dst>" to an existing but empty
dataset, the receive will complete successfully but spuriously fail with exit
status 1 and the message "cannot mount 'pool/dataset': mountpoint or dataset is
busy".

For example,

zpool create pool vtbd
zfs create pool/src
zfs create pool/dst
touch /pool/src/foo
zfs snapshot pool/src at 1
zfs send -p pool/src at 1 | zfs receive -F pool/dst
cannot mount 'pool/dst': mountpoint or dataset is busy

The root cause is a merge error made in r344569 and MFCed in r345578, which
merged changes a10d50f999 and e63ac16d25 from ZoL.  The merge:
* failed to flip a == to an != like the upstream change did, and
* Left out one chunk

This bug affects stable/12, but not head.  It looks like stable/11 is affected
too, but I haven't tested yet.

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