[gnome-calendar] test: properly initialize variables

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

commit c51957f214b7b6f56d98501ec7232d3be99a6dde
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Feb 26 23:39:15 2018 -0300

    test: properly initialize variables

 tests/test-event.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/tests/test-event.c b/tests/test-event.c
index 08d908c6..18c10853 100644
--- a/tests/test-event.c
+++ b/tests/test-event.c
@@ -34,10 +34,10 @@
 static void
 event_new (void)
 {
-  g_autoptr (ECalComponent) component;
-  g_autoptr (GcalEvent) event;
-  g_autoptr (ESource) source;
-  g_autoptr (GError) error;
+  g_autoptr (ECalComponent) component = NULL;
+  g_autoptr (GcalEvent) event = NULL;
+  g_autoptr (ESource) source = NULL;
+  g_autoptr (GError) error = NULL;
 
   component = e_cal_component_new_from_string (STUB_EVENT);
   source = e_source_new_with_uid ("stub", NULL, &error);