post: just pass the string struct to the post format functions
post: just pass the string struct to the post format functions

There's no reason to complicated the code with passing a C string and a
length when we can just pass in the whole struct.

Signed-off-by: Josef 'Jeff' Sipek <a620f141433c70aa9e43778305a6c68cbfadfb25@josefsipek.net>

jeffpc/blahgd,jeffpc/blahgd