[PATCH] Fix ocserv tun read/write on FreeBSD

[Brian Chu]

Hi Nikos,

In commit 9d51069 you added handling for the additional 4-byte packet
header that's present on OpenBSD. However, this is broken on FreeBSD
because whilst TUNSIFHEAD is defined, it is not set by default. The
attached patch fixes this by setting this ioctl after creating the tun
device. I've also attached 2 trivial patches for fixing an extraneous
return value and indentation.

Cheers,
Brian
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