[PATCH spice-server] char-device: Allow to more safely and quickly get device instance

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This information is retrieved multiple time.
Avoid to use just g_object_get which is dynamic so potentially
unsafe and slow.

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 server/char-device.c | 5 +++++
 server/char-device.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/server/char-device.c b/server/char-device.c
index 03ac9907c..36e22dee3 100644
--- a/server/char-device.c
+++ b/server/char-device.c
@@ -1166,6 +1166,11 @@ SPICE_GNUC_VISIBLE void spice_server_port_event(SpiceCharDeviceInstance *sin, ui
     return klass->port_event(sin->st, event);
 }
 
+SpiceCharDeviceInstance *red_char_device_get_device_instance(RedCharDevice *dev)
+{
+    return dev->priv->sin;
+}
+
 static void
 red_char_device_init(RedCharDevice *self)
 {
diff --git a/server/char-device.h b/server/char-device.h
index 0a87045b7..830ca456d 100644
--- a/server/char-device.h
+++ b/server/char-device.h
@@ -243,6 +243,8 @@ RedCharDevice *spicevmc_device_connect(RedsState *reds,
                                        uint8_t channel_type);
 void spicevmc_device_disconnect(SpiceCharDeviceInstance *char_device);
 
+SpiceCharDeviceInstance *red_char_device_get_device_instance(RedCharDevice *dev);
+
 SpiceCharDeviceInterface *spice_char_device_get_interface(SpiceCharDeviceInstance *instance);
 
 #endif /* CHAR_DEVICE_H_ */
-- 
2.21.0

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