avformat/act: Check ff_get_wav_header() for failure

Fixes: missing error check
Fixes: CID717495
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/act.c

@@ -68,6 +68,7 @@ static int read_header(AVFormatContext *s)
     AVIOContext *pb = s->pb;
     int size;
     AVStream* st;
+    int ret;
 
     int min,sec,msec;
 
@@ -77,7 +78,9 @@ static int read_header(AVFormatContext *s)
 
     avio_skip(pb, 16);
     size=avio_rl32(pb);
-    ff_get_wav_header(s, pb, st->codecpar, size, 0);
+    ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
+    if (ret < 0)
+        return ret;
 
     /*
       8000Hz (Fine-rec) file format has 10 bytes long