[tracker] libtracker-sparql, libtracker-bus: Fix compilation warning in vala code

[Philip Van Hoof <pvanhoof src gnome org>]

commit bb99beea68f5c5ec48bbba28d85d86d1b6eb6c2f
Author: Philip Van Hoof <philip codeminded be>
Date:   Mon Dec 6 13:11:39 2010 +0100

    libtracker-sparql, libtracker-bus: Fix compilation warning in vala code

 src/libtracker-bus/tracker-bus.vala           |    2 +-
 src/libtracker-sparql/tracker-backend.vala    |    2 +-
 src/libtracker-sparql/tracker-connection.vala |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/libtracker-bus/tracker-bus.vala b/src/libtracker-bus/tracker-bus.vala
index 52970ca..e17c9fc 100644
--- a/src/libtracker-bus/tracker-bus.vala
+++ b/src/libtracker-bus/tracker-bus.vala
@@ -198,7 +198,7 @@ public class Tracker.Bus.Connection : Tracker.Sparql.Connection {
 		}
 	}
 
-	public async override GenericArray<Error?> update_array_async (string[] sparql, int priority = GLib.Priority.DEFAULT, Cancellable? cancellable = null) throws Sparql.Error, IOError, DBusError {
+	public async override GenericArray<Error?>? update_array_async (string[] sparql, int priority = GLib.Priority.DEFAULT, Cancellable? cancellable = null) throws Sparql.Error, IOError, DBusError {
 		UnixInputStream input;
 		UnixOutputStream output;
 		pipe (out input, out output);
diff --git a/src/libtracker-sparql/tracker-backend.vala b/src/libtracker-sparql/tracker-backend.vala
index ffe479f..f21621f 100644
--- a/src/libtracker-sparql/tracker-backend.vala
+++ b/src/libtracker-sparql/tracker-backend.vala
@@ -127,7 +127,7 @@ class Tracker.Sparql.Backend : Connection {
 		yield bus.update_async (sparql, priority, cancellable);
 	}
 
-	public async override GenericArray<Error?> update_array_async (string[] sparql, int priority = GLib.Priority.DEFAULT, Cancellable? cancellable = null) throws Sparql.Error, IOError, DBusError
+	public async override GenericArray<Error?>? update_array_async (string[] sparql, int priority = GLib.Priority.DEFAULT, Cancellable? cancellable = null) throws Sparql.Error, IOError, DBusError
 	requires (bus != null) {
 		return yield bus.update_array_async (sparql, priority, cancellable);
 	}
diff --git a/src/libtracker-sparql/tracker-connection.vala b/src/libtracker-sparql/tracker-connection.vala
index e22780c..cf99709 100644
--- a/src/libtracker-sparql/tracker-connection.vala
+++ b/src/libtracker-sparql/tracker-connection.vala
@@ -487,7 +487,7 @@ public abstract class Tracker.Sparql.Connection : Object {
 	 *
 	 * Since: 0.10
 	 */
-	public async virtual GenericArray<Error?> update_array_async (string[] sparql, int priority = GLib.Priority.DEFAULT, Cancellable? cancellable = null) throws Sparql.Error, IOError, DBusError {
+	public async virtual GenericArray<Error?>? update_array_async (string[] sparql, int priority = GLib.Priority.DEFAULT, Cancellable? cancellable = null) throws Sparql.Error, IOError, DBusError {
 		warning ("Interface 'update_array_async' not implemented");
 		return null;
 	}