Fix return value check for anetTcpAccept

anetTcpAccept returns ANET_ERR, not AE_ERR.

This isn't a physical error since both ANET_ERR
and AE_ERR are -1, but better to be consistent.

src/cluster.c

@@ -388,7 +388,7 @@ void clusterAcceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
     REDIS_NOTUSED(privdata);
 
     cfd = anetTcpAccept(server.neterr, fd, cip, sizeof(cip), &cport);
-    if (cfd == AE_ERR) {
+    if (cfd == ANET_ERR) {
         redisLog(REDIS_VERBOSE,"Accepting cluster node: %s", server.neterr);
         return;
     }

src/networking.c

@@ -587,7 +587,7 @@ void acceptTcpHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
     REDIS_NOTUSED(privdata);
 
     cfd = anetTcpAccept(server.neterr, fd, cip, sizeof(cip), &cport);
-    if (cfd == AE_ERR) {
+    if (cfd == ANET_ERR) {
         redisLog(REDIS_WARNING,"Accepting client connection: %s", server.neterr);
         return;
     }