[Differential] D8904: inet: Fix routing issue by calling if_up()

[sepherosa_gmail.com (Sepherosa Ziehau)]

sepherosa_gmail.com abandoned this revision.

REVISION DETAIL
  https://reviews.freebsd.org/D8904

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To: sepherosa_gmail.com, delphij, royger, decui_microsoft.com, honzhan_microsoft.com, howard0su_gmail.com, adrian, bz, gnn, hiren, rwatson, karels, glebius
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