Fix dwSize argument of VirtualFree call in detect_GetWriteWatch (Win32)

* os_dep.c (detect_GetWriteWatch): Pass 0 (instead of GC_page_size)
to Win32 VirtualFree if GWW_VDB (dwSize must be 0 if MEM_RELEASE
according to MSDN).

1 files changed, 1 insertions, 1 deletions

diff --git a/os_dep.c b/os_dep.c
index 12c0485a..17e55820 100644
--- a/os_dep.c
+++ b/os_dep.c
@@ -1596,7 +1596,7 @@ void GC_register_data_segments(void)
           } else {
             GetWriteWatch_alloc_flag = MEM_WRITE_WATCH;
           }
-          VirtualFree(page, GC_page_size, MEM_RELEASE);
+          VirtualFree(page, 0 /* dwSize */, MEM_RELEASE);
         } else {
           /* GetWriteWatch will be useless. */
           GetWriteWatch_func = NULL;