Remove pointless N < 0 checks

route/tc.c:553:9: warning: comparison of unsigned enum expression < 0 is
always false [-Wtautological-compare]
              if (id < 0 || id > RTNL_TC_STATS_MAX)

Signed-off-by: Thomas Graf <tgraf@suug.ch>
nf: nfnl_*_str2copy_mode() should return int

... to be able to return a negative error code for unknown modes.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
xfrm: Remove unused function __assign_addr()

Signed-off-by: Thomas Graf <tgraf@suug.ch>
nf: Remove unused function htonll()

Signed-off-by: Thomas Graf <tgraf@suug.ch>
xfrm: Remove unused variable sp_id and sa_id

Cc: Sruthi Yellamraju <ysruthi@gmail.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
src: Silence all warnings

Signed-off-by: Thomas Graf <tgraf@suug.ch>
build: Add support for travis-ci

Signed-off-by: Thomas Graf <tgraf@suug.ch>