Emmanuel Vadot dfc9c1d493 loader: tftp: Copy the first block into the cache
tftp_open reads the first block so copy it in the cached data.
If we have more than one block (i.e. we called tftp_read before
tftp_preload) simply just reset the transfer.

Reported by:	mmel
Reviewed by:	mmel, tsoome
MFC after:	2 weeks
Sponsored by:	Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D33697
2021-12-30 16:30:13 +01:00
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