set ptr to nil after free

1 files changed, 1 insertions, 0 deletions

diff --git a/diff.go b/diff.go
index 014cff5..b8f3780 100644
--- a/diff.go
+++ b/diff.go
@@ -147,6 +147,7 @@ func (diff *Diff) Free() error {
 	}
 	runtime.SetFinalizer(diff, nil)
 	C.git_diff_free(diff.ptr)
+	diff.ptr = nil
 	return nil
 }