net: delete QemuOpts when net_client_init() fails.

This fixes the following scenario using QMP.

First, put a bogus argument "foo" to "type", which results in an error.
{"execute": "netdev_add", "arguments": { "type": "foo", "id": "netdev1" } }
Then, call it again with correct argument "user".
{"execute": "netdev_add", "arguments": { "type": "user", "id": "netdev1" } }
This results in "DuplicatedId" error.

Because the first command was invalid, it should be able to reuse the
same "id", and the second command should work.

Reported-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@lab.ntt.co.jp>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

net.c

@@ -1208,6 +1208,10 @@ int do_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
     }
 
     res = net_client_init(mon, opts, 1);
+    if (res < 0) {
+        qemu_opts_del(opts);
+    }
+
     return res;
 }