[balsa] identity: Do not leak identity

[Peter Bloomfield <peterb src gnome org>]

commit 4089366514ddf3e10f3db9b75bbdcddd063d6db1
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Tue May 19 19:23:00 2020 -0400

    identity: Do not leak identity

 libbalsa/identity.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/libbalsa/identity.c b/libbalsa/identity.c
index 448296e33..91a33ef0a 100644
--- a/libbalsa/identity.c
+++ b/libbalsa/identity.c
@@ -420,6 +420,7 @@ sd_response_cb(GtkWidget * dialog, gint response, SelectDialogInfo * sdi)
 
             gtk_tree_model_get(model, &iter, IDENT_COLUMN, &identity, -1);
             sdi->update(sdi->data, identity);
+            g_object_unref(identity);
         }
     }