Print error message when can't bind * on any address.

src/redis.c

@@ -1508,8 +1508,7 @@ void initServer() {
         for (j = 0; j < server.bindaddr_count || j == 0; j++) {
             if (server.bindaddr[j] == NULL) {
                 /* Bind * for both IPv6 and IPv4, we enter here only if
-                 * server.bindaddr_count == 0, so we try to bind and then
-                 * break to exit the loop ASAP. */
+                 * server.bindaddr_count == 0. */
                 server.ipfd[server.ipfd_count] =
                     anetTcp6Server(server.neterr,server.port,NULL);
                 if (server.ipfd[server.ipfd_count] != ANET_ERR)
@@ -1518,7 +1517,10 @@ void initServer() {
                     anetTcpServer(server.neterr,server.port,NULL);
                 if(server.ipfd[server.ipfd_count] != ANET_ERR)
                     server.ipfd_count++;
-                break;
+                /* Exit the loop if we were able to bind * on IPv4 or IPv6,
+                 * otherwise server.ipfd[server.ipfd_count] will be ANET_ERR
+                 * and we'll print an error and exit. */
+                if (server.ipfd_count) break;
             } else if (strchr(server.bindaddr[j],':')) {
                 /* Bind IPv6 address. */
                 server.ipfd[server.ipfd_count] = anetTcp6Server(server.neterr,server.port,server.bindaddr[j]);