[tracker] Compilation warning fixes

[Philip Van Hoof <pvanhoof src gnome org>]

commit 7b34d2f0be5e82c45e8653a40f482c5d3fa4ad2a
Author: Philip Van Hoof <philip codeminded be>
Date:   Fri Aug 28 11:23:14 2009 +0200

    Compilation warning fixes

 src/libtracker-db/tracker-db-interface.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/libtracker-db/tracker-db-interface.c b/src/libtracker-db/tracker-db-interface.c
index 9f63df7..7f259c6 100644
--- a/src/libtracker-db/tracker-db-interface.c
+++ b/src/libtracker-db/tracker-db-interface.c
@@ -507,7 +507,7 @@ tracker_db_cursor_get_value (TrackerDBCursor *cursor,  guint column, GValue *val
 const gchar*
 tracker_db_cursor_get_string (TrackerDBCursor *cursor, guint            column)
 {
-	g_return_if_fail (TRACKER_IS_DB_CURSOR (cursor));
+	g_return_val_if_fail (TRACKER_IS_DB_CURSOR (cursor), NULL);
 
 	return TRACKER_DB_CURSOR_GET_IFACE (cursor)->get_string (cursor, column);
 }
@@ -515,7 +515,7 @@ tracker_db_cursor_get_string (TrackerDBCursor *cursor, guint            column)
 gint
 tracker_db_cursor_get_int (TrackerDBCursor *cursor, guint            column)
 {
-	g_return_if_fail (TRACKER_IS_DB_CURSOR (cursor));
+	g_return_val_if_fail (TRACKER_IS_DB_CURSOR (cursor), -1);
 
 	return TRACKER_DB_CURSOR_GET_IFACE (cursor)->get_int (cursor, column);
 }
@@ -523,7 +523,7 @@ tracker_db_cursor_get_int (TrackerDBCursor *cursor, guint            column)
 gdouble
 tracker_db_cursor_get_double (TrackerDBCursor *cursor, guint            column)
 {
-	g_return_if_fail (TRACKER_IS_DB_CURSOR (cursor));
+	g_return_val_if_fail (TRACKER_IS_DB_CURSOR (cursor), -1);
 
 	return TRACKER_DB_CURSOR_GET_IFACE (cursor)->get_double (cursor, column);
 }