[rygel] media-export: Remove some nullables in MediaCache.

[Krzesimir Nowak <krnowak src gnome org>]

commit a68c62d136e6771cec3e909b285f75b74f1428fe
Author: Krzesimir Nowak <krnowak openismus com>
Date:   Mon Feb 4 16:37:45 2013 +0100

    media-export: Remove some nullables in MediaCache.
    
    Some functions either shouldn't (and they don't) receive NULL
    parameters (otherwise they would crash) or never return NULL strings.

 .../rygel-media-export-media-cache.vala            |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/src/plugins/media-export/rygel-media-export-media-cache.vala b/src/plugins/media-export/rygel-media-export-media-cache.vala
index 79051e4..7e89ac9 100644
--- a/src/plugins/media-export/rygel-media-export-media-cache.vala
+++ b/src/plugins/media-export/rygel-media-export-media-cache.vala
@@ -837,9 +837,9 @@ public class Rygel.MediaExport.MediaCache : Object {
         }
     }
 
-    private static string? logical_expression_to_sql
-                                        (LogicalExpression? expression,
-                                         GLib.ValueArray    args)
+    private static string logical_expression_to_sql
+                                        (LogicalExpression expression,
+                                         GLib.ValueArray   args)
                                          throws Error {
         string left_sql_string = MediaCache.search_expression_to_sql
                                         (expression.operand1,
@@ -933,8 +933,8 @@ public class Rygel.MediaExport.MediaCache : Object {
     }
 
     private static string? relational_expression_to_sql
-                                        (RelationalExpression? exp,
-                                         GLib.ValueArray       args)
+                                        (RelationalExpression exp,
+                                         GLib.ValueArray      args)
                                          throws Error {
         GLib.Value? v = null;
         string collate = null;