[IPVS]: Fix IPVS sync state check.

Patch from Horms <horms@vergenet.net>

Since both the primay and the backup sync daemon can be started in a box
at a time, we must just check if the MASTER bit is set in the sync state.

net/ipv4/ipvs/ip_vs_core.c

@@ -1044,7 +1044,7 @@ ip_vs_in(unsigned int hooknum, struct sk_buff **pskb,
 	/* increase its packet counter and check if it is needed
 	   to be synchronized */
 	atomic_inc(&cp->in_pkts);
-	if (ip_vs_sync_state == IP_VS_STATE_MASTER &&
+	if ((ip_vs_sync_state & IP_VS_STATE_MASTER) &&
 	    (cp->protocol != IPPROTO_TCP ||
 	     cp->state == IP_VS_TCP_S_ESTABLISHED) &&
 	    (atomic_read(&cp->in_pkts) % sysctl_ip_vs_sync_threshold[1]