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2021-06-15T16:57:32.061890Z
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netgraph/ng_base: Renaming a node to the same name is a noop

Detailed analysis in https://github.com/genneko/freebsd-vimage-jails/issues/2
brought the problem down to a double call of ng_node_name() before and
after a vnet move.  Because the name of the node is already known
(occupied by itself), the second call fails.

PR:		241954
Reported by:	Paul Armstrong
Differential Revision: https://reviews.freebsd.org/D30110

(cherry picked from commit 0345fd891fe13a191fc0fae9463ea9458bfaff5a)

Git Hash:   b57a593cb2d69a684e4be04e8cea7fe7a7f43b24
Git Author: donner@FreeBSD.org
END