dccp: Fix memleak in __feat_register_sp
If dccp_feat_push_change fails, we forget free the mem which is alloced by kmemdup in dccp_feat_clone_sp_val. Reported-by: NHulk Robot <hulkci@huawei.com> Fixes: e8ef967a ("dccp: Registration routines for changing feature values") Reviewed-by: NMukesh Ojha <mojha@codeaurora.org> Signed-off-by: NYueHaibing <yuehaibing@huawei.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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