io: bind to socket before creating QIOChannelSocket

In the QIOChannelSocket test we create a socket file
descriptor and then try to create a QIOChannelSocket.
This works on Linux, but fails on Win32 because it is
not valid to call getsockname() on an unbound socket.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

tests/test-io-channel-socket.c

@@ -470,10 +470,20 @@ static void test_io_channel_ipv4_fd(void)
 {
     QIOChannel *ioc;
     int fd = -1;
+    struct sockaddr_in sa = {
+        .sin_family = AF_INET,
+        .sin_addr = {
+            .s_addr =  htonl(INADDR_LOOPBACK),
+        }
+        /* Leave port unset for auto-assign */
+    };
+    socklen_t salen = sizeof(sa);
 
     fd = socket(AF_INET, SOCK_STREAM, 0);
     g_assert_cmpint(fd, >, -1);
 
+    g_assert_cmpint(bind(fd, (struct sockaddr *)&sa, salen), ==, 0);
+
     ioc = qio_channel_new_fd(fd, &error_abort);
 
     g_assert_cmpstr(object_get_typename(OBJECT(ioc)),