[NETFILTER]: conntrack: get rid of sparse warnings

Teach sparse about locking here, and fix signed/unsigned warnings.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/netfilter/nf_conntrack_irc.c
Simple merge

diff --cc net/netfilter/nf_conntrack_proto_sctp.c
Simple merge

diff --cc net/netfilter/nf_conntrack_proto_tcp.c
Simple merge

diff --cc net/netfilter/nf_conntrack_sip.c
Simple merge

diff --cc net/netfilter/nf_conntrack_standalone.c
Simple merge

diff --cc net/netfilter/nf_conntrack_tftp.c
Simple merge