avcodec/avpacket: use av_dict_iterate

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/avpacket.c

@@ -316,7 +316,7 @@ uint8_t *av_packet_pack_dictionary(AVDictionary *dict, size_t *size)
         const AVDictionaryEntry *t = NULL;
         size_t total_length = 0;
 
-        while ((t = av_dict_get(dict, "", t, AV_DICT_IGNORE_SUFFIX))) {
+        while ((t = av_dict_iterate(dict, t))) {
             for (int i = 0; i < 2; i++) {
                 const char  *str = i ? t->value : t->key;
                 const size_t len = strlen(str) + 1;