diff --git a/mercurial/thirdparty/xdiff/xprepare.c b/mercurial/thirdparty/xdiff/xprepare.c
--- a/mercurial/thirdparty/xdiff/xprepare.c
+++ b/mercurial/thirdparty/xdiff/xprepare.c
@@ -62,7 +62,6 @@
 static int xdl_clean_mmatch(char const *dis, long i, long s, long e);
 static int xdl_cleanup_records(xdlclassifier_t *cf, xdfile_t *xdf1, xdfile_t *xdf2);
 static int xdl_trim_ends(xdfile_t *xdf1, xdfile_t *xdf2);
-static int xdl_optimize_ctxs(xdlclassifier_t *cf, xdfile_t *xdf1, xdfile_t *xdf2);
 
 
 
@@ -282,7 +281,14 @@
 		return -1;
 	}
 
-	if (xdl_optimize_ctxs(&cf, &xe->xdf1, &xe->xdf2) < 0) {
+	if (xdl_trim_ends(&xe->xdf1, &xe->xdf2) < 0) {
+		xdl_free_ctx(&xe->xdf2);
+		xdl_free_ctx(&xe->xdf1);
+		xdl_free_classifier(&cf);
+		return -1;
+	}
+
+	if (xdl_cleanup_records(&cf, &xe->xdf1, &xe->xdf2) < 0) {
 		xdl_free_ctx(&xe->xdf2);
 		xdl_free_ctx(&xe->xdf1);
 		xdl_free_classifier(&cf);
@@ -452,15 +458,3 @@
 
 	return 0;
 }
-
-
-static int xdl_optimize_ctxs(xdlclassifier_t *cf, xdfile_t *xdf1, xdfile_t *xdf2) {
-
-	if (xdl_trim_ends(xdf1, xdf2) < 0 ||
-	    xdl_cleanup_records(cf, xdf1, xdf2) < 0) {
-
-		return -1;
-	}
-
-	return 0;
-}