Fix several missing msg_t::close calls.

I traced memory leaks found using AddressSanitizer down to these.

src/stream.cpp

@@ -229,6 +229,8 @@ int zmq::stream_t::xrecv (msg_t *msg_)
     //  Rather than sendig this frame, we keep it in prefetched
     //  buffer and send a frame with peer's ID.
     blob_t identity = pipe->get_identity ();
+    rc = msg_->close();
+    errno_assert (rc == 0);
     rc = msg_->init_size (identity.size ());
     errno_assert (rc == 0);
 

tests/test_client_server.cpp

@@ -56,6 +56,8 @@ int main (void)
     rc = zmq_msg_send(&msg, client, 0);
     assert (rc == 1);
 
+    rc = zmq_msg_init(&msg);
+    assert (rc == 0);
     rc = zmq_msg_recv(&msg, server, 0);
     assert (rc == 1);    
 
@@ -80,6 +82,9 @@ int main (void)
     rc = zmq_msg_recv(&msg, client, 0);
     assert (rc == 1);
 
+    rc = zmq_msg_close(&msg);
+    assert (rc == 0);
+
     rc = zmq_close (server);
     assert (rc == 0);
 

tests/test_srcfd.cpp

@@ -75,6 +75,9 @@ int main (void)
     int srcFd = zmq_msg_get(&msg, ZMQ_SRCFD);
     assert(srcFd >= 0);
 
+    rc = zmq_msg_close(&msg);
+    assert (rc == 0);
+
 	  // get the remote endpoint
     struct sockaddr_storage ss;
 #ifdef ZMQ_HAVE_HPUX

tests/test_stream_disconnect.cpp

@@ -91,6 +91,8 @@ int main(int, char**)
     assert (rc != -1);
     assert(zmq_msg_size (&peer_frame) > 0);
     assert (has_more (sockets [SERVER]));
+    rc = zmq_msg_close (&peer_frame);
+    assert (rc == 0);
 
     // Server: Grab the 2nd frame (actual payload).
     zmq_msg_t data_frame;
@@ -99,6 +101,8 @@ int main(int, char**)
     rc = zmq_msg_recv (&data_frame, sockets [SERVER], 0);
     assert (rc != -1);
     assert(zmq_msg_size (&data_frame) == 0);
+    rc = zmq_msg_close (&data_frame);
+    assert (rc == 0);
 
     // Client: Grab the 1st frame (peer identity).
     rc = zmq_msg_init (&peer_frame);
@@ -107,6 +111,8 @@ int main(int, char**)
     assert (rc != -1);
     assert(zmq_msg_size (&peer_frame) > 0);
     assert (has_more (sockets [CLIENT]));
+    rc = zmq_msg_close (&peer_frame);
+    assert (rc == 0);
 
     // Client: Grab the 2nd frame (actual payload).
     rc = zmq_msg_init (&data_frame);
@@ -114,6 +120,8 @@ int main(int, char**)
     rc = zmq_msg_recv (&data_frame, sockets [CLIENT], 0);
     assert (rc != -1);
     assert(zmq_msg_size (&data_frame) == 0);
+    rc = zmq_msg_close (&data_frame);
+    assert (rc == 0);
 
     // Send initial message.
     char blob_data [256];