update: Fix vlc_update header when UPDATE_CHECK is disabled.

include/vlc_update.h

@@ -26,8 +26,6 @@
   #error You are not libvlc or one of its plugins. You cannot include this file
 #endif
 
-#ifdef UPDATE_CHECK
-
 #ifndef _VLC_UPDATE_H
 #define _VLC_UPDATE_H
 
@@ -39,6 +37,8 @@
  * @{
  */
 
+#ifdef UPDATE_CHECK
+
 /**
  * Describes an update VLC release number
  */
@@ -52,6 +52,9 @@ struct update_release_t
     char* psz_desc;     ///< Release description
 };
 
+
+#endif /* UPDATE_CHECK */
+
 typedef struct update_release_t update_release_t;
 
 #define update_New( a ) __update_New( VLC_OBJECT( a ) )
@@ -67,6 +70,4 @@ VLC_EXPORT( update_release_t*, update_GetRelease, ( update_t * ) );
  * @}
  */
 
-#endif
-
-#endif
+#endif /* _VLC_UPDATE_H */