Maintenance.

* Fix setting the GSETTINGS_SCHEMA_DIR environment variable.
* Use g_value_take_boxed() instead of deprecated
  g_value_set_boxed_take_ownership().
* Remove an unused variable.
* Clean up load_category() a bit.

liblogdiag/ld-diagram-connection.c

@@ -98,7 +98,7 @@ ld_diagram_connection_get_property (GObject *object, guint property_id,
 
 	case PROP_POINTS:
 		points = ld_diagram_connection_get_points (self);
-		g_value_set_boxed_take_ownership (value, points);
+		g_value_take_boxed (value, points);
 		break;
 	default:
 		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);

liblogdiag/ld-diagram-view.c

@@ -2392,11 +2392,8 @@ on_scroll (GtkWidget *widget, GdkEventScroll *event, gpointer user_data)
 {
 	gdouble prev_x, prev_y;
 	gdouble new_x, new_y;
-	LdPoint point;
 	LdDiagramView *self;
 
-	point.x = event->x;
-	point.y = event->y;
 	self = LD_DIAGRAM_VIEW (widget);
 
 	if (self->priv->operation != OPER_0

liblogdiag/ld-library.c

@@ -167,7 +167,7 @@ LoadCategoryData;
 static LdSymbolCategory *
 load_category (LdLibrary *self, const gchar *path, const gchar *name)
 {
-	LdSymbolCategory *cat;
+	LdSymbolCategory *cat = NULL;
 	gchar *icon_file, *category_file;
 	gchar *human_name;
 	LoadCategoryData data;
@@ -200,13 +200,10 @@ load_category (LdLibrary *self, const gchar *path, const gchar *name)
 
 	g_free (human_name);
 	g_free (category_file);
-	g_free (icon_file);
-	return cat;
-
 load_category_fail_2:
 	g_free (icon_file);
 load_category_fail_1:
-	return NULL;
+	return cat;
 }
 
 /*