mptcp: add new mptcp_fill_diag helper
Will be re-used from getsockopt path. Since diag can be a module, we can't export the helper from diag, it needs to be moved to core. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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