[Bug 240539] tuntap: Getting "ifconfig: ioctl SIOCSIFNAME (set name): File exists" from `ifconfig tap create name tap0`

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240539

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kevans
Date: Thu Sep 12 15:36:49 UTC 2019
New revision: 352246
URL: https://svnweb.freebsd.org/changeset/base/352246

Log:
  SIOCSIFNAME: Do nothing if we're not actually changing

  Instead of throwing EEXIST, just succeed if the name isn't actually
  changing. We don't need to trigger departure or any of that because there's
  no change from consumers' perspective.

  PR:           240539
  Reviewed by:  brooks
  MFC after:    5 days
  Differential Revision:        https://reviews.freebsd.org/D21618

Changes:
  head/sys/net/if.c

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