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[9front] audio/flacenc: fix error check for fseeko
fseeko returns 0 on success, not the new stream position.

This allows flacenc to update the streaminfo block when it is finished
(for example to set the number of samples and checksum).

--- a/sys/src/cmd/audio/flacenc/flacenc.c

+++ b/sys/src/cmd/audio/flacenc/flacenc.c

@@ -18,7 +18,7 @@

 static FLAC__StreamEncoderSeekStatus

 encseek(FLAC__StreamEncoder *enc, FLAC__uint64 absolute_byte_offset, void *client_data)

 {

-	return fseeko(stdout, absolute_byte_offset, SEEK_SET) != absolute_byte_offset ?

+	return fseeko(stdout, absolute_byte_offset, SEEK_SET) != 0 ?

 		FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED :

 		FLAC__STREAM_ENCODER_SEEK_STATUS_OK;

 }