gtp: simplify error handling code in 'gtp_encap_enable()'
'gtp_encap_disable_sock(sk)' handles the case where sk is NULL, so there is no need to test it before calling the function. This saves a few line of code. Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: NSimon Horman <simon.horman@netronome.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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