[NETFILTER]: nfnetlink: remove unrequired check in nfnetlink_get_subsys

subsys_table is initialized to NULL, therefore just returns NULL in case
that it is not set.
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/netfilter/nfnetlink.c

@@ -94,8 +94,7 @@ static inline struct nfnetlink_subsystem *nfnetlink_get_subsys(u_int16_t type)
 {
 	u_int8_t subsys_id = NFNL_SUBSYS_ID(type);
 
-	if (subsys_id >= NFNL_SUBSYS_COUNT
-	    || subsys_table[subsys_id] == NULL)
+	if (subsys_id >= NFNL_SUBSYS_COUNT)
 		return NULL;
 
 	return subsys_table[subsys_id];