Check whether to switch to fail when setting the node to pfail in cron (#1061)

This may speed up the transition to the fail state a bit.
Previously we would only check when we received a pfail/fail
report from others in gossip. If myself is the last vote,
we can directly switch to fail in here without waiting for
the next gossip packet.

Signed-off-by: Binbin <binloveplay1314@qq.com>

src/cluster_legacy.c

@@ -5217,7 +5217,7 @@ void clusterCron(void) {
             if (!(node->flags & (CLUSTER_NODE_PFAIL | CLUSTER_NODE_FAIL))) {
                 node->flags |= CLUSTER_NODE_PFAIL;
                 update_state = 1;
-                if (server.cluster->size == 1 && clusterNodeIsVotingPrimary(myself)) {
+                if (clusterNodeIsVotingPrimary(myself)) {
                     markNodeAsFailingIfNeeded(node);
                 } else {
                     serverLog(LL_NOTICE, "NODE %.40s (%s) possibly failing.", node->name, node->human_nodename);