[INET]: Consolidate xxx_find() in fragment management

Here we need another callback ->match to check whether the
entry found in hash matches the key passed. The key used 
is the same as the creation argument for inet_frag_create.

Yet again, this ->match is the same for netfilter and ipv6.
Running a frew steps forward - this callback will later
replace the ->equal one.

Since the inet_frag_find() uses the already consolidated
inet_frag_create() remove the xxx_frag_create from protocol
codes.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ipv6.h

@@ -387,6 +387,7 @@ struct ip6_create_arg {
 };
 
 void ip6_frag_init(struct inet_frag_queue *q, void *a);
+int ip6_frag_match(struct inet_frag_queue *q, void *a);
 
 static inline int ipv6_addr_any(const struct in6_addr *a)
 {