[FFmpeg-cvslog] Fix avisynth_context_create constructor error handling.

[d s]

ffmpeg | branch: master | d s <avxsynth-testing at gmail.com> | Tue Mar 26 19:36:18 2013 -0700| [444001bda6adbabf458823b92a9b2a4991457d8d] | committer: Michael Niedermayer

Fix avisynth_context_create constructor error handling.

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=444001bda6adbabf458823b92a9b2a4991457d8d
---

 libavformat/avisynth.c |   18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/libavformat/avisynth.c b/libavformat/avisynth.c
index d31031d..3119a45 100644
--- a/libavformat/avisynth.c
+++ b/libavformat/avisynth.c
@@ -164,26 +164,22 @@ static av_cold int avisynth_context_create(AVFormatContext *s) {
             return ret;
     }
 
-    if (!avs)
-        return AVERROR_UNKNOWN;
-
-    if (!avs_ctx_list) {
-        avs_ctx_list = avs;
-    } else {
-        avs->next = avs_ctx_list;
-        avs_ctx_list = avs;
-    }
-
     avs->env = avs_library->avs_create_script_environment(3);
     if (avs_library->avs_get_error) {
         const char *error = avs_library->avs_get_error(avs->env);
         if (error) {
             av_log(s, AV_LOG_ERROR, "%s\n", error);
-            av_free(avs);
             return AVERROR_UNKNOWN;
         }
     }
 
+    if (!avs_ctx_list) {
+        avs_ctx_list = avs;
+    } else {
+        avs->next = avs_ctx_list;
+        avs_ctx_list = avs;
+    }
+
     return 0;
 }