Merge remote-tracking branch 'qatar/master'

* qatar/master:
  oggparsetheora: check av_mallocz result

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/oggparsetheora.c

@@ -50,6 +50,8 @@ static int theora_header(AVFormatContext *s, int idx)
 
     if (!thp) {
         thp = av_mallocz(sizeof(*thp));
+        if (!thp)
+            return AVERROR(ENOMEM);
         os->private = thp;
     }