correct mutex creation on win32 to be in unlocked state (#63)

git-svn-id: http://svn.osgeo.org/metacrs/proj/branches/4.7@1832 4e78687f-474d-0410-85f9-8d5e500ac6b2

ChangeLog

@@ -1,3 +1,8 @@
+2010-01-25  Frank Warmerdam  <warmerdam@pobox.com>
+
+	* src/pj_mutex.c: fix creation of mutex on win32 to be in
+	unacquired state in pj_init_lock to avoid an extra reference. (#63)
+
 2009-09-24  Frank Warmerdam  <warmerdam@pobox.com>
 
 	* nad/Makefile.am: add ntv2 and ignf testing if grid shift files

src/pj_mutex.c

@@ -181,8 +181,8 @@ void pj_release_lock()
 {
     if( mutex_lock == NULL )
         pj_init_lock();
-
-    ReleaseMutex( mutex_lock );
+    else
+        ReleaseMutex( mutex_lock );
 }
 
 /************************************************************************/
@@ -205,7 +205,7 @@ static void pj_init_lock()
 
 {
     if( mutex_lock == NULL )
-        mutex_lock = CreateMutex( NULL, TRUE, NULL );
+        mutex_lock = CreateMutex( NULL, FALSE, NULL );
 }
 
 #endif // def MUTEX_win32