ifnet: Fix decreasing the vnet interface count

It should be decreased only when the interface has been successfully
removed from the "active" list.

This prevents vnet_if_return() from potential OOB writes to the
allocated memory "pending".

Reviewed by: kp, pouria
Fixes: a779388f8bb3 if: Protect V_ifnet in vnet_if_return()
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D55873

(cherry picked from commit 8065ff63c0e5c3bb4abb02f55b20cb47bb51d1a7)