avformat/wavdec: use AV_OPT_TYPE_BOOL for ignore_length

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavformat/wavdec.c

@@ -636,7 +636,7 @@ static int wav_read_seek(AVFormatContext *s,
 #define OFFSET(x) offsetof(WAVDemuxContext, x)
 #define DEC AV_OPT_FLAG_DECODING_PARAM
 static const AVOption demux_options[] = {
-    { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, DEC },
+    { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },
     { NULL },
 };