From 2a40ab6ad660c37b22e82991696d0c40e70da79b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tim-Philipp=20M=C3=BCller?= <tim@centricular.com>
Date: Tue, 23 Jan 2018 14:49:51 +0000
Subject: [PATCH] decklink: don't crash if there are no decklink devices

Fixes generic/states check.
---
 sys/decklink/gstdecklink.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sys/decklink/gstdecklink.cpp b/sys/decklink/gstdecklink.cpp
index b561316920..94698a6893 100644
--- a/sys/decklink/gstdecklink.cpp
+++ b/sys/decklink/gstdecklink.cpp
@@ -1286,6 +1286,9 @@ gst_decklink_acquire_nth_output (gint n, GstElement * sink, gboolean is_audio)
 
   g_once (&devices_once, init_devices, NULL);
 
+  if (devices == NULL)
+    return NULL;
+
   if (n < 0 || (guint) n >= devices->len)
     return NULL;
 
@@ -1318,6 +1321,9 @@ gst_decklink_release_nth_output (gint n, GstElement * sink, gboolean is_audio)
   GstDecklinkOutput *output;
   Device *device;
 
+  if (devices == NULL)
+    return;
+
   if (n < 0 || (guint) n >= devices->len)
     return;
 
@@ -1346,6 +1352,9 @@ gst_decklink_acquire_nth_input (gint n, GstElement * src, gboolean is_audio)
 
   g_once (&devices_once, init_devices, NULL);
 
+  if (devices == NULL)
+    return NULL;
+
   if (n < 0 || (guint) n >= devices->len)
     return NULL;
 
@@ -1380,6 +1389,9 @@ gst_decklink_release_nth_input (gint n, GstElement * src, gboolean is_audio)
   GstDecklinkInput *input;
   Device *device;
 
+  if (devices == NULL)
+    return;
+
   if (n < 0 || (guint) n >= devices->len)
     return;