io: initialize sockets in test program

The win32 sockets layer requires that socket_init() is called
otherwise nothing will work.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

tests/test-io-channel-socket.c

@@ -489,6 +489,7 @@ int main(int argc, char **argv)
     bool has_ipv4, has_ipv6;
 
     module_call_init(MODULE_INIT_QOM);
+    socket_init();
 
     g_test_init(&argc, &argv, NULL);