mmap(win32): avoid copy-on-write when it is unnecessary

diff --git a/xdiff/xprepare.c b/xdiff/xprepare.c
index 63a22c630e521969b08c8ecb1ce9fa3e0f3ff513..13b55aba7441bc84d2c5c075110e9ef798ba18f8 100644 (file)
--- a/xdiff/xprepare.c
+++ b/xdiff/xprepare.c
@@ -301,10 +301,11 @@ int xdl_prepare_env(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
 
                xdl_free_ctx(&xe->xdf2);
                xdl_free_ctx(&xe->xdf1);
+               xdl_free_classifier(&cf);
                return -1;
        }
 
-       if (!(xpp->flags & XDF_HISTOGRAM_DIFF))
+       if (XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF)
                xdl_free_classifier(&cf);
 
        return 0;