gre: minor cleanups in netlink interface
- use typeful helpers for IFLA_GRE_LOCAL/IFLA_GRE_REMOTE - replace magic value by FIELD_SIZEOF - use MODULE_ALIAS_RTNL_LINK macro Signed-off-by: NPatrick McHardy <kaber@trash.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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