sbappend_ktls_rx() read the receiving interface of each packet header it
demotes from the chain's first mbuf, whose header it had zeroed on the first
pass. A chain of two packets or more thus had no interface, and a change of
input interface went unnoticed: the TLS receive tag stayed on the old interface
until a later append of one packet.
Read it from the packet being demoted, as the decrypted mark is.
Fixes: fe8c78f0d2 ("ktls: Add full support for TLS RX offloading via network interface.")
Approved by: gallatin
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D60758
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