qemu-socket: don't leak opts on error

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

util/qemu-sockets.c

@@ -963,7 +963,7 @@ int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
 
     default:
         error_setg(errp, "socket type unsupported for datagram");
-        return -1;
+        fd = -1;
     }
     qemu_opts_del(opts);
     return fd;