Merge branch 'sb/test-bitmap-free-at-end' into maint

An earlier leakfix to bitmap testing code was incomplete.

* sb/test-bitmap-free-at-end:
  test_bitmap_walk: free bitmap with bitmap_free

pack-bitmap.c

@@ -985,7 +985,7 @@ void test_bitmap_walk(struct rev_info *revs)
 	else
 		fprintf(stderr, "Mismatch!\n");
 
-	free(result);
+	bitmap_free(result);
 }
 
 static int rebuild_bitmap(uint32_t *reposition,