This patch makes sure the gtk binary also outputs an error message if it
cannot open the mixer.  In the old situation, it would just return with
a non-zero exit value.  The return calls are replaced by calls to
ErrorExitWarn().  Also, in ErrorExitWarn() the gtk interface hasn't been
initialised yet, so we don't have to (and mustn't) call CloseScreen().

Patch by Bas Zoetekouw <bas@debian.org>

diff -Naur aumix-2.8.orig/src/common.c aumix-2.8/src/common.c
--- aumix-2.8.orig/src/common.c	2002-10-29 22:27:51.000000000 +0100
+++ aumix-2.8/src/common.c	2002-11-29 21:43:15.000000000 +0100
@@ -218,11 +218,11 @@
 	if (interactive == IN_GTK) {
 #ifndef DUMMY_MIXER
 		if ((mixer_fd = open(device_filename, O_RDWR)) < 0)
-			return EOPENMIX;
+			ErrorExitWarn(EOPENMIX, 'e');
 #endif				/* DUMMY_MIXER */
 		ErrorExitWarn(MixerStatus(), 'e');
 		if (!devmask)
-			return EFINDDEVICE;
+			ErrorExitWarn(EFINDDEVICE, 'e');
 		gtk_init(&argc, &argv);
 		InitScreenGTK();
 		gtk_main();
@@ -264,7 +264,8 @@
 	if (!error)
 		return;
 #if HAVE_CURSES
-	if (mode == 'e')	/* exit */
+	if ((mode == 'e') && 
+	    (interactive == IN_CURSES) ) /* erase curses screen */
 		CloseScreen();
 #endif				/* HAVE_CURSES */
 	if (error > 12) {