MFC r257078

MFC r257078
  Fix panic in the tap driver when a tap and vmnet interface were
  created after each other e.g.

   ifconfig tap0
   ifconfig vmnet0
   <panic>

  Appears to be a cut'n'paste error from the tap code to the vmnet
  code where the name string wasn't updated in the call to make_dev().

Approved by:  re (glebius)

git-svn-id: svn://svn.freebsd.org/base/stable/10@257285 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f