avformat/dhav: always initializer ret

libavformat/dhav.c

@@ -146,7 +146,7 @@ static const uint32_t sample_rates[] = {
 static int parse_ext(AVFormatContext *s, int length)
 {
     DHAVContext *dhav = s->priv_data;
-    int index, ret;
+    int index, ret = 0;
 
     while (length > 0) {
         int type = avio_r8(s->pb);