[libgda] Fix memory leak in mutex for GdaConnection

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 0bd9059ea49eba3c74bd042eab0c6bc39495e127
Author: Daniel Espinosa <esodan gmail com>
Date:   Sun Apr 14 20:22:51 2019 -0500

    Fix memory leak in mutex for GdaConnection

 libgda/gda-connection.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/libgda/gda-connection.c b/libgda/gda-connection.c
index 871abcf22..79f9a4a5e 100644
--- a/libgda/gda-connection.c
+++ b/libgda/gda-connection.c
@@ -121,6 +121,7 @@ typedef struct {
 
        /* multi threading locking */
        GRecMutex             rmutex;
+  gboolean              mutex_initalized;
 
        /* auto meta data update */
        GArray               *trans_meta_context; /* Array of GdaMetaContext pointers */
@@ -435,6 +436,7 @@ gda_connection_init (GdaConnection *cnc)
 
        GdaConnectionPrivate *priv = gda_connection_get_instance_private (cnc);
        g_rec_mutex_init (&priv->rmutex);
+  priv->mutex_initalized = TRUE;
        priv->provider_obj = NULL;
        priv->dsn = NULL;
        priv->cnc_string = NULL;
@@ -543,6 +545,10 @@ gda_connection_dispose (GObject *object)
                g_free (priv->auth_string);
                priv->auth_string = NULL;
        }
+  if (priv->mutex_initalized) {
+    g_rec_mutex_clear (&priv->rmutex);
+    priv->mutex_initalized = FALSE;
+  }
 
        /* chain to parent class */
   G_OBJECT_CLASS (gda_connection_parent_class)->dispose (object);