[cheese] Avoid dereferencing an uninitialized variable

[David King <davidk src gnome org>]

commit 79fdc6011468b891b1a8d21103da57cec1d38041
Author: David King <amigadave amigadave com>
Date:   Tue Sep 16 14:41:01 2014 +0100

    Avoid dereferencing an uninitialized variable
    
    Found with Coverity (CID 56653).

 src/thumbview/eog-thumb-nav.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/thumbview/eog-thumb-nav.c b/src/thumbview/eog-thumb-nav.c
index b170391..5a4114d 100644
--- a/src/thumbview/eog-thumb-nav.c
+++ b/src/thumbview/eog-thumb-nav.c
@@ -619,6 +619,8 @@ eog_thumb_nav_get_show_buttons (EogThumbNav *nav)
 
   g_return_val_if_fail (EOG_IS_THUMB_NAV (nav), FALSE);
 
+  priv = eog_thumb_nav_get_instance_private (nav);
+
   return priv->show_buttons;
 }