From b8419654bd2f93dac48e04241e16ea7b61db9604 Mon Sep 17 00:00:00 2001
From: Filip Navara <filip.navara@gmail.com>
Date: Thu, 17 Mar 2005 23:16:12 +0000
Subject: [PATCH] Don't try to release mutex with NULL handle. Also prevent
 releasing the same mutex twice.

svn path=/trunk/; revision=14168
---
 reactos/lib/kernel32/debug/output.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/reactos/lib/kernel32/debug/output.c b/reactos/lib/kernel32/debug/output.c
index 517b40ab0c4..3394047c041 100644
--- a/reactos/lib/kernel32/debug/output.c
+++ b/reactos/lib/kernel32/debug/output.c
@@ -456,7 +456,8 @@ VOID WINAPI OutputDebugStringA(LPCSTR _OutputString)
    if(hDBMonDataReady) CloseHandle(hDBMonDataReady);
 
    /* leave the critical section */
-   ReleaseMutex(hDBMonMutex);
+   if(hDBMonDataReady != NULL)
+    ReleaseMutex(hDBMonMutex);
 #if 0
   }
  }