np e16f1bf84a Unbreak VLANs after r337943.
ether_set_pcp should not be called from ether_output_frame for VLAN
interfaces -- the vid + pcp will be inserted during vlan_transmit in
that case. r337943 sets the VLAN's ifnet's if_pcp to a proper PCP value
and this led to double encapsulation (once with vid 0 and second time
with vid+pcp).

PR: 230794
Reviewed by:	kib@
Approved by:	re@ (gjb@)
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D16887
2018-08-24 21:48:13 +00:00
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