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Fixed loop start for STK modules

--- a/dumb/src/it/readmod.c

+++ b/dumb/src/it/readmod.c

@@ -118,7 +118,7 @@

-static int it_mod_read_sample_header(IT_SAMPLE *sample, DUMBFILE *f)

+static int it_mod_read_sample_header(IT_SAMPLE *sample, DUMBFILE *f, int stk)

 {

 	int finetune, loop_start, loop_length;

@@ -141,7 +141,8 @@

 /** Each  finetune step changes  the note 1/8th  of  a  semitone. */

 	sample->global_volume = 64;

 	sample->default_volume = dumbfile_getc(f); // Should we be setting global_volume to this instead?

-	loop_start = dumbfile_mgetw(f) << 1;

+	loop_start = dumbfile_mgetw(f);

+	if ( !stk ) loop_start <<= 1;

 	loop_length = dumbfile_mgetw(f) << 1;

 	if ( loop_length > 2 && loop_start + loop_length > sample->length && loop_start / 2 + loop_length <= sample->length )

 		loop_start /= 2;

@@ -411,7 +412,7 @@

 		sigdata->sample[i].data = NULL;

 	for (i = 0; i < sigdata->n_samples; i++) {

-		if (it_mod_read_sample_header(&sigdata->sample[i], f)) {

+		if (it_mod_read_sample_header(&sigdata->sample[i], f, sigdata->n_samples == 15)) {

 			_dumb_it_unload_sigdata(sigdata);

             return NULL;

 		}