vc1test: Check malloc call

Signed-off-by: Diego Biurrun <diego@biurrun.de>

libavformat/vc1test.c

@@ -62,6 +62,8 @@ static int vc1t_read_header(AVFormatContext *s)
     st->codec->codec_id = AV_CODEC_ID_WMV3;
 
     st->codec->extradata = av_malloc(VC1_EXTRADATA_SIZE);
+    if (!st->codec->extradata)
+        return AVERROR(ENOMEM);
     st->codec->extradata_size = VC1_EXTRADATA_SIZE;
     avio_read(pb, st->codec->extradata, VC1_EXTRADATA_SIZE);
     st->codec->height = avio_rl32(pb);