ipvs: initialize tbl->entries after allocation

tbl->entries is not initialized after kmalloc(), therefore
causes an uninit-value warning in ip_vs_lblc_check_expire()
as reported by syzbot.

Reported-by: <[e-mail]>
Cc: Simon Horman <[e-mail]>
Cc: Julian Anastasov <[e-mail]>
Cc: Pablo Neira Ayuso <[e-mail]>
Signed-off-by: Cong Wang <[e-mail]>
Acked-by: Julian Anastasov <[e-mail]>
Acked-by: Simon Horman <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

net/netfilter/ipvs/ip_vs_lblcr.c

···
 	tbl->counter = 1;
 	tbl->dead = false;
 	tbl->svc = svc;
+	atomic_set(&tbl->entries, 0);
 
 	/*
 	 *    Hook periodic timer for garbage collection