Merge commit 'ac467d94'

* commit 'ac467d94':
  lcl: return an appropriate error code
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/lclenc.c

@@ -165,7 +165,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
     zret = deflateInit(&c->zstream, c->compression);
     if (zret != Z_OK) {
         av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
-        return 1;
+        return AVERROR_UNKNOWN;
     }
 
     return 0;