John Baldwin 8e9313caa6 Convert unmapped mbufs before computing checksums in IPsec.
This is similar to the logic used in ip_output() to convert mbufs
prior to computing checksums.  Unmapped mbufs can be sent when using
sendfile() over IPsec or using KTLS over IPsec.

Reported by:	Sony Arpita Das @ Chelsio QA
Reviewed by:	np
Sponsored by:	Chelsio
Differential Revision:	https://reviews.freebsd.org/D28187
2021-01-19 11:52:00 -08:00
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