ipv4: Use less conflicting local var name in change_nexthops() loop macro.
As noticed by H Hartley Sweeten, since change_nexthops() uses 'nh'
as it's iterator variable, it can conflict with other existing
local vars.
Use "nexthop_nh" to avoid the conflict and make it easier to figure
out where this magic variable comes from.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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