net: Remove redundant oif checks in rt6_device_match
The oif has already been checked that it is non-zero; the 2 additional checks on oif within that if (oif) {...} block are redundant. CC: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: NDavid Ahern <dsa@cumulusnetworks.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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