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security_secid_to_secctx() returns the size of the new context, whereas previous versions provided that via a pointer parameter. Correct the type of the value returned in nfqnl_get_sk_secctx() and the check for error in netlbl_unlhsh_add(). Add an error check. Fixes: 2d470c778120 ("lsm: replace context+len with lsm_context") Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Paul Moore <paul@paul-moore.com>