[gnome-calendar] event: Fix leak of alarm (GHashTable)

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit aee120b898a84f9a78d193b0e9ab0a492167cc59
Author: Victor Toso <me victortoso com>
Date:   Fri Sep 30 23:47:46 2016 +0200

    event: Fix leak of alarm (GHashTable)
    
    105,858 (42,064 direct, 63,794 indirect) bytes in 478 blocks are definitely lost in loss record 19,065 of 
19,103
       at 0x4C2DB9D: malloc (vg_replace_malloc.c:299)
       by 0x9A0C90E: g_malloc (gmem.c:94)
       by 0x9A26A55: g_slice_alloc (gslice.c:1025)
       by 0x99F0510: g_hash_table_new_full (ghash.c:711)
       by 0x42B10C: gcal_event_init (gcal-event.c:657)
       by 0x9584B32: g_type_create_instance (gtype.c:1866)
       by 0x956BED0: g_object_new_internal (gobject.c:1783)
       by 0x956CB24: g_object_new_valist (gobject.c:2042)
       by 0x878945D: g_initable_new_valist (ginitable.c:224)
       by 0x878933A: g_initable_new (ginitable.c:146)
       by 0x42B181: gcal_event_new (gcal-event.c:690)
       by 0x4549CA: gcal_year_view_component_added (gcal-year-view.c:1632)
    
    https://bugzilla.gnome.org/show_bug.cgi?id=772272

 src/gcal-event.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/gcal-event.c b/src/gcal-event.c
index 3f920e3..5c76cfe 100644
--- a/src/gcal-event.c
+++ b/src/gcal-event.c
@@ -371,6 +371,7 @@ gcal_event_finalize (GObject *object)
   g_clear_pointer (&self->dt_end, g_date_time_unref);
   g_clear_pointer (&self->timezone, g_time_zone_unref);
   g_clear_pointer (&self->description, g_free);
+  g_clear_pointer (&self->alarms, g_hash_table_unref);
   g_clear_object (&self->component);
   g_clear_object (&self->source);