Allow all free functions to be called on null

2 files changed, 10 insertions, 6 deletions

diff --git a/src/ring.c b/src/ring.c
index 6e26ebc..4a4692f 100644
--- a/src/ring.c
+++ b/src/ring.c
@@ -80,8 +80,10 @@ zix_ring_new(uint32_t size)
 void
 zix_ring_free(ZixRing* ring)
 {
-  free(ring->buf);
-  free(ring);
+  if (ring) {
+    free(ring->buf);
+    free(ring);
+  }
 }
 
 void
diff --git a/src/strindex.c b/src/strindex.c
index 6443a59..9a6d952 100644
--- a/src/strindex.c
+++ b/src/strindex.c
@@ -82,10 +82,12 @@ zix_strindex_free_rec(ZixStrindexNode* n)
 void
 zix_strindex_free(ZixStrindex* strindex)
 {
-  zix_strindex_free_rec(strindex->root);
-  free(strindex->s);
-  free(strindex->root);
-  free(strindex);
+  if (strindex) {
+    zix_strindex_free_rec(strindex->root);
+    free(strindex->s);
+    free(strindex->root);
+    free(strindex);
+  }
 }
 
 static inline int