diff -r 6cc5d01a58a6 -r d9e87566f879 mercurial/cext/bdiff.c
--- a/mercurial/cext/bdiff.c	Sun May 20 23:05:18 2018 -0400
+++ b/mercurial/cext/bdiff.c	Wed Jun 13 10:37:39 2018 -0400
@@ -155,12 +155,8 @@
 		PyEval_RestoreThread(_save);
 	PyBuffer_Release(&ba);
 	PyBuffer_Release(&bb);
-	if (al) {
-		free(al);
-	}
-	if (bl) {
-		free(bl);
-	}
+	free(al);
+	free(bl);
 	if (l.next) {
 		bdiff_freehunks(l.next);
 	}