[PPP]: Fix two bugs wrt. compression/decompression.
This patch fixes two bugs that were stopping PPP compression (and in
particular, Deflate compression) from working.
The first bug was pointed out by Richard Moats. In the conversion to
use pskb_may_pull, we ended up with a bogus test which basically meant
that the kernel driver never saw the CCP conf-ack packets and thus
never enabled compression.
The second bug crept in with the change of DEFLATE_MIN_SIZE from 8 to
9. Changing that definition had the unfortunate side-effect of
changing the way that the code interpreted the encoded Deflate
parameter bytes. This meant that we were using the wrong window size,
twice what we had actually negotiated with the peer.
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