[PATCH v5 07/16] reftable: all xxx_free() functions accept NULL arguments

["Han-Wen Nienhuys via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: Han-Wen Nienhuys <hanwen@xxxxxxxxxx>

This fixes NULL derefs in error paths. Spotted by Coverity.

Signed-off-by: Han-Wen Nienhuys <hanwen@xxxxxxxxxx>
---
 reftable/reader.c | 2 ++
 reftable/writer.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/reftable/reader.c b/reftable/reader.c
index 0d16b098f5e..c7a32331c76 100644
--- a/reftable/reader.c
+++ b/reftable/reader.c
@@ -647,6 +647,8 @@ int reftable_new_reader(struct reftable_reader **p,
 
 void reftable_reader_free(struct reftable_reader *r)
 {
+	if (!r)
+		return;
 	reader_close(r);
 	reftable_free(r);
 }
diff --git a/reftable/writer.c b/reftable/writer.c
index 3ca721e9f64..9fd24fa93ce 100644
--- a/reftable/writer.c
+++ b/reftable/writer.c
@@ -150,6 +150,8 @@ void reftable_writer_set_limits(struct reftable_writer *w, uint64_t min,
 
 void reftable_writer_free(struct reftable_writer *w)
 {
+	if (!w)
+		return;
 	reftable_free(w->block);
 	reftable_free(w);
 }
-- 
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