dccp ccid-2: whitespace fix-up

This fixes whitespace noise introduced in commit "dccp ccid-2: Algorithm to
update buffer state", 5753fdfe, 14 Nov 2010.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>