geli: Avoid destroying a destroyed geli geom in g_eli_last_close()
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Authored by markj on Thu, Sep 24, 1:55 PM.

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	F173382910: D59985.id187601.diff
	Fri, Sep 25, 2:33 PM

	F173382448: D59985.diff
	Fri, Sep 25, 2:28 PM

	F173377948: D59985.id.diff
	Fri, Sep 25, 1:41 PM

	F173362672: D59985.id187601.diff
	Fri, Sep 25, 11:19 AM

	F173340607: D59985.diff
	Fri, Sep 25, 8:18 AM

	F173292173: D59985.diff
	Fri, Sep 25, 1:18 AM

	F173292032: D59985.id187601.diff
	Fri, Sep 25, 1:17 AM

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Summary

I believe g_eli_last_close() may run after a GELI GEOM has already been
destroyed. g_eli_destroy() handles this case, but returns ENXIO, and
this trips the assertion in g_eli_last_close(). Simply check for this
condition in advance to avoid tripping the assertion.