From 60ed70ef5047cad45e94b673edf4e975874f114c Mon Sep 17 00:00:00 2001
From: smf- <smf-@users.noreply.github.com>
Date: Sat, 16 Mar 2013 11:52:50 +0000
Subject: [PATCH] revision 21548 caused "trace off" to crash with a access
 violation [smf]

---
 src/emu/debug/debugcmd.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/emu/debug/debugcmd.c b/src/emu/debug/debugcmd.c
index 4ceeb684edf..7e9fd071ee7 100644
--- a/src/emu/debug/debugcmd.c
+++ b/src/emu/debug/debugcmd.c
@@ -2544,12 +2544,8 @@ static void execute_trace_internal(running_machine &machine, int ref, int params
 	if (!debug_command_parameter_command(machine, action = param[2]))
 		return;
 
-	/* further validation */
-	if (mame_stricmp(filename, "off") == 0)
-		filename = NULL;
-
 	/* open the file */
-	if (filename)
+	if (mame_stricmp(filename, "off") != 0)
 	{
 		mode = "w";