[longomatch] Fix segfault when no devices are presents

[Andoni Morales Alastruey <amorales src gnome org>]

commit fe07b0998b361da4e1e72a5c44cbecafa3214a39
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Thu Sep 4 17:32:18 2014 +0200

    Fix segfault when no devices are presents

 libcesarplayer/gst-camera-capturer.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/libcesarplayer/gst-camera-capturer.c b/libcesarplayer/gst-camera-capturer.c
index 9616413..99e8653 100644
--- a/libcesarplayer/gst-camera-capturer.c
+++ b/libcesarplayer/gst-camera-capturer.c
@@ -1370,8 +1370,10 @@ gst_camera_capturer_enum_devices (const gchar * device_name)
 
 finish:
   {
-    gst_element_set_state (device, GST_STATE_NULL);
-    gst_object_unref (GST_OBJECT (device));
+    if (device != NULL) {
+      gst_element_set_state (device, GST_STATE_NULL);
+      gst_object_unref (GST_OBJECT (device));
+    }
     return list;
   }
 }