ipvlan: Add new func ipvlan_is_valid_dev instead of duplicated codes
There are multiple duplicated condition checks in the current codes, so I add the new func ipvlan_is_valid_dev instead of the duplicated codes to check if the netdev is real ipvlan dev. Signed-off-by: Gao Feng <gfree.wind@vip.163.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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