increase the size of the buffer by a factor of 1.5

Which is more cache and memory manager friendly.

Reference: https://github.com/facebook/folly/blob/main/folly/docs/FBVector.md#memory-handling

srtp/srtp.c

@@ -4906,10 +4906,10 @@ srtp_err_status_t srtp_stream_list_insert(srtp_stream_list_t list,
 {
     /*
      * there is no space to hold the new entry in the entries buffer,
-     * double the size of the buffer.
+     * increase the size of the buffer by a factor of 1.5.
      */
     if (list->size == list->capacity) {
-        size_t new_capacity = list->capacity * 2;
+        size_t new_capacity = list->capacity + ((list->capacity + 1u) / 2u);
         list_entry *new_entries =
             srtp_crypto_alloc(sizeof(list_entry) * new_capacity);
         if (new_entries == NULL) {