fix some resulting segfaults

daemon/bencode.c

@@ -84,6 +84,7 @@ int bencode_buffer_init(bencode_buffer_t *buf) {
 	buf->pieces = __bencode_piece_new(0);
 	if (!buf->pieces)
 		return -1;
+	buf->free_list = NULL;
 	return 0;
 }
 

daemon/bencode.h

@@ -97,10 +97,9 @@ static inline bencode_item_t *bencode_dictionary_add_string(bencode_item_t *dict
 /* Ditto, but for a "str" object */
 static inline bencode_item_t *bencode_dictionary_add_str(bencode_item_t *dict, const char *key, const str *val);
 
-/* Ditto again, but adds the buffer which contains the string (val->s) to the bencode_buffer_t's
- * internal free list. When the bencode_item_t object is destroyed, BENCODE_FREE will be called
- * on this buffer. */
-static inline bencode_item_t *bencode_dictionary_add_str_free(bencode_item_t *dict, const char *key, const str *val);
+/* Ditto again, but adds the str object (val) to the bencode_buffer_t's internal free list. When
+ * the bencode_item_t object is destroyed, BENCODE_FREE will be called on this pointer. */
+static inline bencode_item_t *bencode_dictionary_add_str_free(bencode_item_t *dict, const char *key, str *val);
 
 /* Convenience function to add an integer value to a dictionary */
 static inline bencode_item_t *bencode_dictionary_add_integer(bencode_item_t *dict, const char *key, long long int val);
@@ -275,10 +274,10 @@ static inline bencode_item_t *bencode_dictionary_add_str(bencode_item_t *dict, c
 	return bencode_dictionary_add(dict, key, bencode_str(dict->buffer, val));
 }
 
-static inline bencode_item_t *bencode_dictionary_add_str_free(bencode_item_t *dict, const char *key, const str *val) {
+static inline bencode_item_t *bencode_dictionary_add_str_free(bencode_item_t *dict, const char *key, str *val) {
 	if (!val)
 		return NULL;
-	bencode_buffer_freelist_add(dict->buffer, val->s);
+	bencode_buffer_freelist_add(dict->buffer, val);
 	return bencode_dictionary_add(dict, key, bencode_str(dict->buffer, val));
 }