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usage: style it better

--- a/main.c

+++ b/main.c

@@ -208,7 +208,7 @@

 static void

 usage(void)

 {

-	fprint(2, "usage: %s [-a AUDIOFILE] [-S subtitles] [-t N -t M ...] file.mp4\n", argv0);

+	fprint(2, "usage: %s [-a audiofile] [-S subtitlesfile] [-t n -t m ...] file.mp4\n", argv0);

 	threadexitsall("usage");

 }

@@ -257,13 +257,6 @@

 		}

 		audio = EARGF(usage());

 		break;

-	case 'S':

-		if(sub != nil){

-			fprint(2, "only one subtitle file can be specified\n");

-			usage();

-		}

-		sub = EARGF(usage());

-		break;

 	case 'B':

 		benchmark++;

 		break;

@@ -275,6 +268,13 @@

 		break;

 	case 'd':

 		debug++;

+		break;

+	case 'S':

+		if(sub != nil){

+			fprint(2, "only one subtitle file can be specified\n");

+			usage();

+		}

+		sub = EARGF(usage());

 		break;

 	case 't':

 		trackpref |= 1<<atoi(EARGF(usage()));