Make zix_hash_free() tolerate NULL

2 files changed, 6 insertions, 0 deletions

diff --git a/test/hash_test.c b/test/hash_test.c
index 8b3e9de..ea808e6 100644
--- a/test/hash_test.c
+++ b/test/hash_test.c
@@ -202,6 +202,8 @@ stress(void)
 int
 main(void)
 {
+	zix_hash_free(NULL);
+
 	if (stress()) {
 		return 1;
 	}
diff --git a/zix/hash.c b/zix/hash.c
index e8acfea..c4a2dba 100644
--- a/zix/hash.c
+++ b/zix/hash.c
@@ -75,6 +75,10 @@ zix_hash_new(ZixHashFunc  hash_func,
 ZIX_API void
 zix_hash_free(ZixHash* hash)
 {
+	if (!hash) {
+		return;
+	}
+
 	for (unsigned b = 0; b < *hash->n_buckets; ++b) {
 		ZixHashEntry* bucket = hash->buckets[b];
 		for (ZixHashEntry* e = bucket; e;) {