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moddec: fix usage, add -n option to skip audio

--- a/examples/moddec.c

+++ b/examples/moddec.c

@@ -15,7 +15,7 @@

 static void

 usage(void)

 {

-	fprint(2, "usage: %s [FILE]\n", argv0);

+	fprint(2, "usage: %s [-n] [-s SECONDS]\n", argv0);

 	exits("usage");

 }

@@ -23,10 +23,10 @@

 main(int argc, char **argv)

 {

 	DUMB_IT_SIGRENDERER *itren;

+	int n, sz, r, noaudio;

 	DUH_SIGRENDERER *ren;

 	sample_t **samp;

 	char *data, *t;

-	int n, sz, r;

 	double pos;

 	long nsamp;

 	DUH *f;

@@ -33,8 +33,12 @@

 	setfcr(getfcr() & ~(FPINVAL|FPOVFL));

+	noaudio = 0;

 	pos = 0.0;

 	ARGBEGIN{

+	case 'n':

+		noaudio = 1;

+		break;

 	case 's':

 		pos = atof(EARGF(usage()));

 		break;

@@ -59,11 +63,13 @@

 			break;

 	}

-	if((f = dumb_read_any(dumbfile_open_memory(data, sz), 1, 0)) == nil)

+	if((f = dumb_read_any(dumbfile_open_memory(data, sz), 0, 0)) == nil)

 		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);

+	if(noaudio)

+		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);