ipvs: change comparison on sync_refresh_period

The sync_refresh_period variable is unsigned, so it can never be < 0.

Signed-off-by: Aaron Conole <aconole@bytheb.org>
Signed-off-by: Simon Horman <horms@verge.net.au>
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index 30d6b2c..0e5b64a 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -520,7 +520,7 @@
 		if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) &&
 		    pkts % sync_period != sysctl_sync_threshold(ipvs))
 			return 0;
-	} else if (sync_refresh_period <= 0 &&
+	} else if (!sync_refresh_period &&
 		   pkts != sysctl_sync_threshold(ipvs))
 		return 0;