FreeBSD/src d97753b (r344235)sys/contrib/libnv nvpair.c

libnv: fix double free

In r343986 we introduced a double free. The structure was already
freed fixed in the r302966. This problem was introduced
because the GitHub version was out of sync with the FreeBSD one.

Submitted by:   Mindaugas Rasiukevicius <rmind at netbsd.org>
MFC with:       r343986
DeltaFile
+0-8sys/contrib/libnv/nvpair.c
+0-81 files

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