mptcp: Remove set but not used variable 'can_ack'
Fixes gcc '-Wunused-but-set-variable' warning: net/mptcp/options.c: In function 'mptcp_established_options_dss': net/mptcp/options.c:338:7: warning: variable 'can_ack' set but not used [-Wunused-but-set-variable] commit dc093db5 ("mptcp: drop unneeded checks") leave behind this unused, remove it. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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