dccp qpolicy: Parameter checking of cmsg qpolicy parameters

Ensure that cmsg->cmsg_type value is valid for qpolicy
that is currently in use.

Signed-off-by: Tomasz Grobelny <tomasz@grobelny.oswiecenia.net>
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>

diff --cc net/dccp/dccp.h
Simple merge

diff --cc net/dccp/proto.c
Simple merge

diff --cc net/dccp/qpolicy.c
Simple merge