nf: nfnl_*_str2copy_mode() should return int

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

[thaller@redhat.com: This is potentially an ABI break, but since
the size of the enum is implementation defined, it seems
anyway unstable to have them as function arguments/return values.]

http://lists.infradead.org/pipermail/libnl/2014-August/001616.html

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

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

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

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

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Thomas Haller <thaller@redhat.com>
Merge branch 'tgraf/trivial-fixes'

http://lists.infradead.org/pipermail/libnl/2014-August/001614.html

Signed-off-by: Thomas Haller <thaller@redhat.com>