netfilter: nfnetlink_cthelper: hit EBUSY on updates if size mismatches
The private helper data size cannot be updated. However, updates that contain NFCTH_PRIV_DATA_LEN might bogusly hit EBUSY even if the size is the same. Fixes: 12f7a505 ("netfilter: add user-space connection tracking helper infrastructure") Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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