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moddec: do not play anything if seeking past the end

--- a/examples/moddec.c

+++ b/examples/moddec.c

@@ -20,10 +20,10 @@

 void

 main(int argc, char **argv)

 {

+	double pos, freq, ratio, dur;

 	DUMB_IT_SIGRENDERER *itren;

 	DUH_SIGRENDERER *ren;

 	int n, sz, r, resamp;

-	double pos, freq, ratio;

 	sample_t **samp;

 	char *data, *t;

 	long nsamp;

@@ -75,7 +75,10 @@

 		sysfatal("unknown/invalid mod");

 	if((t = (char*)duh_get_tag(f, "TITLE")) != nil && *t)

 		fprint(2, "%s\n", t);

-	fprint(2, "duration: %g\n", duh_get_length(f)*ratio/100000.0);

+	dur = duh_get_length(f)*ratio/100000.0;

+	fprint(2, "duration: %g\n", dur);

+	if(pos > dur)

+		exits(nil);

 	ren = duh_start_sigrenderer(f, 0, 2, pos*100000.0/ratio);

 	itren = duh_get_it_sigrenderer(ren);

 	dumb_it_set_loop_callback(itren, dumb_it_callback_terminate, nil);