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

diff --git a/xdiff/xmerge.c b/xdiff/xmerge.c
index d98f430c912bead3ee5381eafd195dde4d709c47..f338ad6c757cda29a052960a504715c062ab5dda 100644 (file)
--- a/xdiff/xmerge.c
+++ b/xdiff/xmerge.c
@@ -641,8 +641,11 @@ int xdl_merge(mmfile_t *orig, mmfile_t *mf1, mmfile_t *mf2,
        result->ptr = NULL;
        result->size = 0;
 
-       if (xdl_do_diff(orig, mf1, xpp, &xe1) < 0 ||
-                       xdl_do_diff(orig, mf2, xpp, &xe2) < 0) {
+       if (xdl_do_diff(orig, mf1, xpp, &xe1) < 0) {
+               return -1;
+       }
+       if (xdl_do_diff(orig, mf2, xpp, &xe2) < 0) {
+               xdl_free_env(&xe1);
                return -1;
        }
        if (xdl_change_compact(&xe1.xdf1, &xe1.xdf2, xpp->flags) < 0 ||
@@ -654,6 +657,8 @@ int xdl_merge(mmfile_t *orig, mmfile_t *mf1, mmfile_t *mf2,
        if (xdl_change_compact(&xe2.xdf1, &xe2.xdf2, xpp->flags) < 0 ||
            xdl_change_compact(&xe2.xdf2, &xe2.xdf1, xpp->flags) < 0 ||
            xdl_build_script(&xe2, &xscr2) < 0) {
+               xdl_free_script(xscr1);
+               xdl_free_env(&xe1);
                xdl_free_env(&xe2);
                return -1;
        }