decoder/wavpack: allow fine-grained seeking

First multiply the floating point return value of
decoder_seek_where(), then cast to integer.

NEWS

@@ -9,6 +9,7 @@ ver 0.15.7 (2009/??/??)
   - id3: fix ID3v1 charset conversion
 * decoders:
   - ffmpeg: don't try to force stereo
+  - wavpack: allow fine-grained seeking
 * mixer: explicitly close all mixers on shutdown
 * mapper: fix memory leak when playlist_directory is not set
 * mapper: apply filesystem_charset to playlists

src/decoder/wavpack_plugin.c

@@ -185,10 +185,9 @@ wavpack_decode(struct decoder *decoder, WavpackContext *wpc, bool can_seek,
 	do {
 		if (decoder_get_command(decoder) == DECODE_COMMAND_SEEK) {
 			if (can_seek) {
-				int where;
+				unsigned where = decoder_seek_where(decoder) *
+					audio_format.sample_rate;
 
-				where = decoder_seek_where(decoder);
-				where *= audio_format.sample_rate;
 				if (WavpackSeekSample(wpc, where)) {
 					position = where;
 					decoder_command_finished(decoder);