[navaraf] 14168: Don't try to release mutex with NULL handle. Also prevent releasing the same mutex twice.

Don't try to release mutex with NULL handle. Also prevent releasing the
same mutex twice.
Modified: trunk/reactos/lib/kernel32/debug/output.c
  _____  

Modified: trunk/reactos/lib/kernel32/debug/output.c
--- trunk/reactos/lib/kernel32/debug/output.c	2005-03-17 22:40:19 UTC
(rev 14167)
+++ trunk/reactos/lib/kernel32/debug/output.c	2005-03-17 23:16:12 UTC
(rev 14168)
@@ -456,7 +456,8 @@

    if(hDBMonDataReady) CloseHandle(hDBMonDataReady);
 
    /* leave the critical section */
-   ReleaseMutex(hDBMonMutex);
+   if(hDBMonDataReady != NULL)
+    ReleaseMutex(hDBMonMutex);
 #if 0
   }
  }