mptcp: use mptcp_stop_timer

Use the helper mptcp_stop_timer() instead of using sk_stop_timer() to
stop icsk_retransmit_timer directly.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>