[NaCl SDK] IPV6_JOIN_GROUP should call JoinGroup, not LeaveGroup

native_client_sdk/src/libraries/nacl_io/socket/udp_node.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "nacl_io/socket/udp_node.h"
 
 #include <errno.h>
 #include <string.h>
 
 #include <algorithm>
@@ skipping 418 matching lines @@
       return 0;
     }
     case IPV6_JOIN_GROUP: {
       const struct ipv6_mreq* mreq =
           static_cast<const struct ipv6_mreq*>(optval);
       struct sockaddr_in6 sin = {0};
       sin.sin6_family = AF_INET6;
       memcpy(&sin.sin6_addr, &mreq->ipv6mr_multiaddr, sizeof(struct in6_addr));
 
       PP_Resource net_addr = SockAddrIn6ToResource(&sin, sizeof(sin));
-      int32_t error = UDPInterface()->LeaveGroup(socket_resource_, net_addr,
-                                                 PP_BlockUntilComplete());
+      int32_t error = UDPInterface()->JoinGroup(socket_resource_, net_addr,
+                                                PP_BlockUntilComplete());
       return PPERROR_TO_ERRNO(error);
     }
     case IPV6_LEAVE_GROUP: {
       const struct ipv6_mreq* mreq =
           static_cast<const struct ipv6_mreq*>(optval);
       struct sockaddr_in6 sin = {0};
       sin.sin6_family = AF_INET6;
       memcpy(&sin.sin6_addr, &mreq->ipv6mr_multiaddr, sizeof(struct in6_addr));
 
       PP_Resource net_addr = SockAddrIn6ToResource(&sin, sizeof(sin));
       int32_t error = UDPInterface()->LeaveGroup(socket_resource_, net_addr,
                                                  PP_BlockUntilComplete());
       return PPERROR_TO_ERRNO(error);
     }
     default: { break; }
   }
 
   return SocketNode::SetSockOptIPV6(optname, optval, len);
 }
 
 }  // namespace nacl_io