[Bug 236138] Unloading a Kernel module dependent on other kernel module does not return device busy first time

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236138

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
This is how module refcounts work.  kldunload just decrements the
administrative refcount.  But a module isn't unloaded until all refs drop to
zero.

What would you prefer happen?  EBUSY and do not drop the administrative ref if
a module has dependencies?

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