decoder/vorbis: handle uri==NULL

NEWS

@@ -4,6 +4,7 @@ ver 0.15.11 (2010/??/??)
 * decoders:
   - mp4ff: support tags "album artist", "albumartist", "band"
   - mikmod: fix memory leak
+  - vorbis: handle uri==NULL
   - ffmpeg: free AVFormatContext on error
   - ffmpeg: read more metadata
 * playlist: emit IDLE_OPTIONS when resetting single mode

src/decoder/vorbis_plugin.c

@@ -233,6 +233,9 @@ oggvorbis_seekable(struct decoder *decoder)
 	bool seekable;
 
 	uri = decoder_get_uri(decoder);
+	if (uri == NULL)
+		return false;
+
 	/* disable seeking on remote streams, because libvorbis seeks
 	   around like crazy, and due to being very expensive, this
 	   delays song playback my 10 or 20 seconds */