netfilter: helper: Remove unused function declarations

Commit b118509076b3 ("netfilter: remove nf_conntrack_helper sysctl and modparam toggles")
leave these unused declarations.

Signed-off-by: Yue Haibing <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: Florian Westphal <[e-mail]>

include/net/netfilter/nf_conntrack_helper.h

···
 	return (void *)help->data;
 }
 
-void nf_conntrack_helper_pernet_init(struct net *net);
-
 int nf_conntrack_helper_init(void);
 void nf_conntrack_helper_fini(void);
 
···
 int nf_nat_helper_try_module_get(const char *name, u16 l3num,
 				 u8 protonum);
 void nf_nat_helper_put(struct nf_conntrack_helper *helper);
-void nf_ct_set_auto_assign_helper_warned(struct net *net);
 #endif /*_NF_CONNTRACK_HELPER_H*/