net: fib: move metrics parsing to a helper
fib_create_info() is already quite large, so before adding more code to the metrics section move that to a helper, similar to ip6_convert_metrics. Suggested-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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