[FFmpeg-cvslog] hwcontext_opencl: Only release command queue if it exists

[Mark Thompson]

ffmpeg | branch: master | Mark Thompson <sw at jkqxz.net> | Sun Nov 25 19:14:27 2018 +0000| [b9aff7a53d598a7882bfe3db449a3e5dc6543f05] | committer: Mark Thompson

hwcontext_opencl: Only release command queue if it exists

If the frames context creation fails then the command queue reference
need not exist when uninit is called.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b9aff7a53d598a7882bfe3db449a3e5dc6543f05
---

 libavutil/hwcontext_opencl.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/libavutil/hwcontext_opencl.c b/libavutil/hwcontext_opencl.c
index 728877553f..be71c8323e 100644
--- a/libavutil/hwcontext_opencl.c
+++ b/libavutil/hwcontext_opencl.c
@@ -1726,10 +1726,13 @@ static void opencl_frames_uninit(AVHWFramesContext *hwfc)
     av_freep(&priv->mapped_frames);
 #endif
 
-    cle = clReleaseCommandQueue(priv->command_queue);
-    if (cle != CL_SUCCESS) {
-        av_log(hwfc, AV_LOG_ERROR, "Failed to release frame "
-               "command queue: %d.\n", cle);
+    if (priv->command_queue) {
+        cle = clReleaseCommandQueue(priv->command_queue);
+        if (cle != CL_SUCCESS) {
+            av_log(hwfc, AV_LOG_ERROR, "Failed to release frame "
+                   "command queue: %d.\n", cle);
+        }
+        priv->command_queue = NULL;
     }
 }