When a client disconnects, smartcard_channel_client_set_char_device
is called with a NULL "device" argument. In that case there is
no need to take a weak reference to the device.

Without this patch the server complains:
  g_object_add_weak_pointer: assertion 'G_IS_OBJECT (object)' failed

and aborts when a second client attempts to connect.

Signed-off-by: Uri Lublin <u...@redhat.com>
---
 server/smartcard-channel-client.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/server/smartcard-channel-client.c 
b/server/smartcard-channel-client.c
index 3b3fc27cc..49e765b7c 100644
--- a/server/smartcard-channel-client.c
+++ b/server/smartcard-channel-client.c
@@ -389,8 +389,10 @@ void 
smartcard_channel_client_set_char_device(SmartCardChannelClient *scc,
     }
 
     scc->priv->smartcard = device;
-    g_object_add_weak_pointer(G_OBJECT(scc->priv->smartcard),
-                              (gpointer*)&scc->priv->smartcard);
+    if (scc->priv->smartcard) {
+        g_object_add_weak_pointer(G_OBJECT(scc->priv->smartcard),
+                                  (gpointer*)&scc->priv->smartcard);
+    }
 }
 
 RedCharDeviceSmartcard* 
smartcard_channel_client_get_char_device(SmartCardChannelClient *scc)
-- 
2.20.1

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