[tracker] libtracker-sparql: Introspection fix for tracker_notifier_new()

[Sam Thursfield <sthursfield src gnome org>]

commit 30184f29b3487579552912851b568a459a2a703e
Author: Sam Thursfield <sam thursfield codethink co uk>
Date:   Fri Sep 29 13:31:16 2017 +0100

    libtracker-sparql: Introspection fix for tracker_notifier_new()
    
    The tracker_notifier_new() function allows NULL for 'classes'.

 src/libtracker-sparql/tracker-notifier.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/libtracker-sparql/tracker-notifier.c b/src/libtracker-sparql/tracker-notifier.c
index cf73741..a9a10a5 100644
--- a/src/libtracker-sparql/tracker-notifier.c
+++ b/src/libtracker-sparql/tracker-notifier.c
@@ -877,8 +877,8 @@ tracker_notifier_init (TrackerNotifier *notifier)
 
 /**
  * tracker_notifier_new:
- * @classes: (array zero-terminated=1): Array of RDF classes to receive
- *           notifications from, or %NULL for all.
+ * @classes: (array zero-terminated=1) (allow-none): Array of RDF classes to
+ *           receive notifications from, or %NULL for all.
  * @flags: flags affecting the notifier behavior
  * @cancellable: Cancellable for the operation
  * @error: location for the possible resulting error.