Kristof Provost 9dac026822 dummynet: dn_dequeue() may return NULL
If there are no more entries, or if we fail to restore the rcvif of a
queued mbuf dn_dequeue() can return NULL.
Cope with this.

Reviewed by:	glebius
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D34078
2022-01-28 23:09:08 +01:00
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