[libgda] GdaVConnectionDataModel: fix lock issue

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit ad908fb95f446d6e5ed79067c09eacb6a729a88f
Author: Daniel Espinosa Ortiz <esodan gmail com>
Date:   Mon Feb 11 09:27:31 2019 -0600

    GdaVConnectionDataModel: fix lock issue

 libgda/sqlite/virtual/gda-vconnection-data-model.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libgda/sqlite/virtual/gda-vconnection-data-model.c 
b/libgda/sqlite/virtual/gda-vconnection-data-model.c
index 69b767167..29ff07824 100644
--- a/libgda/sqlite/virtual/gda-vconnection-data-model.c
+++ b/libgda/sqlite/virtual/gda-vconnection-data-model.c
@@ -623,9 +623,9 @@ vcontext_free (VContext *context)
 void
 _gda_vconnection_set_working_obj (GdaVconnectionDataModel *cnc, GObject *obj)
 {
+       g_mutex_lock (& (cnc->priv->lock_context));
        GSList *list;
        if (obj) {
-               g_mutex_lock (& (cnc->priv->lock_context));
                for (list = cnc->priv->table_data_list; list; list = list->next) {
                        GdaVConnectionTableData *td = (GdaVConnectionTableData*) list->data;
                        VContext *vc = NULL;
@@ -660,8 +660,8 @@ _gda_vconnection_set_working_obj (GdaVconnectionDataModel *cnc, GObject *obj)
                         * an exception already occurred */
                        td->context.current_vcontext = NULL;
                }
-               g_mutex_unlock (& (cnc->priv->lock_context));
        }
+       g_mutex_unlock (& (cnc->priv->lock_context));
 }
 
 void